aboutsummaryrefslogtreecommitdiff
path: root/fs/ntfs/layout.h
blob: 5c248d404f05432277be8b0d9fb147ff549578b3 (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
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
/*
 * layout.h - All NTFS associated on-disk structures. Part of the Linux-NTFS
 *	      project.
 *
 * Copyright (c) 2001-2005 Anton Altaparmakov
 * Copyright (c) 2002 Richard Russon
 *
 * This program/include file is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program/include file is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program (in the main directory of the Linux-NTFS
 * distribution in the file COPYING); if not, write to the Free Software
 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _LINUX_NTFS_LAYOUT_H
#define _LINUX_NTFS_LAYOUT_H

#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/list.h>
#include <asm/byteorder.h>

#include "types.h"

/*
 * Constant endianness conversion defines.
 */
#define const_le16_to_cpu(x)	__constant_le16_to_cpu(x)
#define const_le32_to_cpu(x)	__constant_le32_to_cpu(x)
#define const_le64_to_cpu(x)	__constant_le64_to_cpu(x)

#define const_cpu_to_le16(x)	__constant_cpu_to_le16(x)
#define const_cpu_to_le32(x)	__constant_cpu_to_le32(x)
#define const_cpu_to_le64(x)	__constant_cpu_to_le64(x)

/* The NTFS oem_id "NTFS    " */
#define magicNTFS	const_cpu_to_le64(0x202020205346544eULL)

/*
 * Location of bootsector on partition:
 *	The standard NTFS_BOOT_SECTOR is on sector 0 of the partition.
 *	On NT4 and above there is one backup copy of the boot sector to
 *	be found on the last sector of the partition (not normally accessible
 *	from within Windows as the bootsector contained number of sectors
 *	value is one less than the actual value!).
 *	On versions of NT 3.51 and earlier, the backup copy was located at
 *	number of sectors/2 (integer divide), i.e. in the middle of the volume.
 */

/*
 * BIOS parameter block (bpb) structure.
 */
typedef struct {
	le16 bytes_per_sector;		/* Size of a sector in bytes. */
	u8  sectors_per_cluster;	/* Size of a cluster in sectors. */
	le16 reserved_sectors;		/* zero */
	u8  fats;			/* zero */
	le16 root_entries;		/* zero */
	le16 sectors;			/* zero */
	u8  media_type;			/* 0xf8 = hard disk */
	le16 sectors_per_fat;		/* zero */
	le16 sectors_per_track;		/* irrelevant */
	le16 heads;			/* irrelevant */
	le32 hidden_sectors;		/* zero */
	le32 large_sectors;		/* zero */
} __attribute__ ((__packed__)) BIOS_PARAMETER_BLOCK;

/*
 * NTFS boot sector structure.
 */
typedef struct {
	u8  jump[3];			/* Irrelevant (jump to boot up code).*/
	le64 oem_id;			/* Magic "NTFS    ". */
	BIOS_PARAMETER_BLOCK bpb;	/* See BIOS_PARAMETER_BLOCK. */
	u8  unused[4];			/* zero, NTFS diskedit.exe states that
					   this is actually:
						__u8 physical_drive;	// 0x80
						__u8 current_head;	// zero
						__u8 extended_boot_signature;
									// 0x80
						__u8 unused;		// zero
					 */
/*0x28*/sle64 number_of_sectors;	/* Number of sectors in volume. Gives
					   maximum volume size of 2^63 sectors.
					   Assuming standard sector size of 512
					   bytes, the maximum byte size is
					   approx. 4.7x10^21 bytes. (-; */
	sle64 mft_lcn;			/* Cluster location of mft data. */
	sle64 mftmirr_lcn;		/* Cluster location of copy of mft. */
	s8  clusters_per_mft_record;	/* Mft record size in clusters. */
	u8  reserved0[3];		/* zero */
	s8  clusters_per_index_record;	/* Index block size in clusters. */
	u8  reserved1[3];		/* zero */
	le64 volume_serial_number;	/* Irrelevant (serial number). */
	le32 checksum;			/* Boot sector checksum. */
/*0x54*/u8  bootstrap[426];		/* Irrelevant (boot up code). */
	le16 end_of_sector_marker;	/* End of bootsector magic. Always is
					   0xaa55 in little endian. */
/* sizeof() = 512 (0x200) bytes */
} __attribute__ ((__packed__)) NTFS_BOOT_SECTOR;

/*
 * Magic identifiers present at the beginning of all ntfs record containing
 * records (like mft records for example).
 */
enum {
	/* Found in $MFT/$DATA. */
	magic_FILE = const_cpu_to_le32(0x454c4946), /* Mft entry. */
	magic_INDX = const_cpu_to_le32(0x58444e49), /* Index buffer. */
	magic_HOLE = const_cpu_to_le32(0x454c4f48), /* ? (NTFS 3.0+?) */

	/* Found in $LogFile/$DATA. */
	magic_RSTR = const_cpu_to_le32(0x52545352), /* Restart page. */
	magic_RCRD = const_cpu_to_le32(0x44524352), /* Log record page. */

	/* Found in $LogFile/$DATA.  (May be found in $MFT/$DATA, also?) */
	magic_CHKD = const_cpu_to_le32(0x444b4843), /* Modified by chkdsk. */

	/* Found in all ntfs record containing records. */
	magic_BAAD = const_cpu_to_le32(0x44414142), /* Failed multi sector
						       transfer was detected. */
	/*
	 * Found in $LogFile/$DATA when a page is full of 0xff bytes and is
	 * thus not initialized.  Page must be initialized before using it.
	 */
	magic_empty = const_cpu_to_le32(0xffffffff) /* Record is empty. */
};

typedef le32 NTFS_RECORD_TYPE;

/*
 * Generic magic comparison macros. Finally found a use for the ## preprocessor
 * operator! (-8
 */

static inline BOOL __ntfs_is_magic(le32 x, NTFS_RECORD_TYPE r)
{
	return (x == r);
}
#define ntfs_is_magic(x, m)	__ntfs_is_magic(x, magic_##m)

static inline BOOL __ntfs_is_magicp(le32 *p, NTFS_RECORD_TYPE r)
{
	return (*p == r);
}
#define ntfs_is_magicp(p, m)	__ntfs_is_magicp(p, magic_##m)

/*
 * Specialised magic comparison macros for the NTFS_RECORD_TYPEs defined above.
 */
#define ntfs_is_file_record(x)		( ntfs_is_magic (x, FILE) )
#define ntfs_is_file_recordp(p)		( ntfs_is_magicp(p, FILE) )
#define ntfs_is_mft_record(x)		( ntfs_is_file_record (x) )
#define ntfs_is_mft_recordp(p)		( ntfs_is_file_recordp(p) )
#define ntfs_is_indx_record(x)		( ntfs_is_magic (x, INDX) )
#define ntfs_is_indx_recordp(p)		( ntfs_is_magicp(p, INDX) )
#define ntfs_is_hole_record(x)		( ntfs_is_magic (x, HOLE) )
#define ntfs_is_hole_recordp(p)		( ntfs_is_magicp(p, HOLE) )

#define ntfs_is_rstr_record(x)		( ntfs_is_magic (x, RSTR) )
#define ntfs_is_rstr_recordp(p)		( ntfs_is_magicp(p, RSTR) )
#define ntfs_is_rcrd_record(x)		( ntfs_is_magic (x, RCRD) )
#define ntfs_is_rcrd_recordp(p)		( ntfs_is_magicp(p, RCRD) )

#define ntfs_is_chkd_record(x)		( ntfs_is_magic (x, CHKD) )
#define ntfs_is_chkd_recordp(p)		( ntfs_is_magicp(p, CHKD) )

#define ntfs_is_baad_record(x)		( ntfs_is_magic (x, BAAD) )
#define ntfs_is_baad_recordp(p)		( ntfs_is_magicp(p, BAAD) )

#define ntfs_is_empty_record(x)		( ntfs_is_magic (x, empty) )
#define ntfs_is_empty_recordp(p)	( ntfs_is_magicp(p, empty) )

/*
 * The Update Sequence Array (usa) is an array of the le16 values which belong
 * to the end of each sector protected by the update sequence record in which
 * this array is contained. Note that the first entry is the Update Sequence
 * Number (usn), a cyclic counter of how many times the protected record has
 * been written to disk. The values 0 and -1 (ie. 0xffff) are not used. All
 * last le16's of each sector have to be equal to the usn (during reading) or
 * are set to it (during writing). If they are not, an incomplete multi sector
 * transfer has occurred when the data was written.
 * The maximum size for the update sequence array is fixed to:
 *	maximum size = usa_ofs + (usa_count * 2) = 510 bytes
 * The 510 bytes comes from the fact that the last le16 in the array has to
 * (obviously) finish before the last le16 of the first 512-byte sector.
 * This formula can be used as a consistency check in that usa_ofs +
 * (usa_count * 2) has to be less than or equal to 510.
 */
typedef struct {
	NTFS_RECORD_TYPE magic;	/* A four-byte magic identifying the record
				   type and/or status. */
	le16 usa_ofs;		/* Offset to the Update Sequence Array (usa)
				   from the start of the ntfs record. */
	le16 usa_count;		/* Number of le16 sized entries in the usa
				   including the Update Sequence Number (usn),
				   thus the number of fixups is the usa_count
				   minus 1. */
} __attribute__ ((__packed__)) NTFS_RECORD;

/*
 * System files mft record numbers. All these files are always marked as used
 * in the bitmap attribute of the mft; presumably in order to avoid accidental
 * allocation for random other mft records. Also, the sequence number for each
 * of the system files is always equal to their mft record number and it is
 * never modified.
 */
typedef enum {
	FILE_MFT       = 0,	/* Master file table (mft). Data attribute
				   contains the entries and bitmap attribute
				   records which ones are in use (bit==1). */
	FILE_MFTMirr   = 1,	/* Mft mirror: copy of first four mft records
				   in data attribute. If cluster size > 4kiB,
				   copy of first N mft records, with
					N = cluster_size / mft_record_size. */
	FILE_LogFile   = 2,	/* Journalling log in data attribute. */
	FILE_Volume    = 3,	/* Volume name attribute and volume information
				   attribute (flags and ntfs version). Windows
				   refers to this file as volume DASD (Direct
				   Access Storage Device). */
	FILE_AttrDef   = 4,	/* Array of attribute definitions in data
				   attribute. */
	FILE_root      = 5,	/* Root directory. */
	FILE_Bitmap    = 6,	/* Allocation bitmap of all clusters (lcns) in
				   data attribute. */
	FILE_Boot      = 7,	/* Boot sector (always at cluster 0) in data
				   attribute. */
	FILE_BadClus   = 8,	/* Contains all bad clusters in the non-resident
				   data attribute. */
	FILE_Secure    = 9,	/* Shared security descriptors in data attribute
				   and two indexes into the descriptors.
				   Appeared in Windows 2000. Before that, this
				   file was named $Quota but was unused. */
	FILE_UpCase    = 10,	/* Uppercase equivalents of all 65536 Unicode
				   characters in data attribute. */
	FILE_Extend    = 11,	/* Directory containing other system files (eg.
				   $ObjId, $Quota, $Reparse and $UsnJrnl). This
				   is new to NTFS3.0. */
	FILE_reserved12 = 12,	/* Reserved for future use (records 12-15). */
	FILE_reserved13 = 13,
	FILE_reserved14 = 14,
	FILE_reserved15 = 15,
	FILE_first_user = 16,	/* First user file, used as test limit for
				   whether to allow opening a file or not. */
} NTFS_SYSTEM_FILES;

/*
 * These are the so far known MFT_RECORD_* flags (16-bit) which contain
 * information about the mft record in which they are present.
 */
enum {
	MFT_RECORD_IN_USE	= const_cpu_to_le16(0x0001),
	MFT_RECORD_IS_DIRECTORY = const_cpu_to_le16(0x0002),
} __attribute__ ((__packed__));

typedef le16 MFT_RECORD_FLAGS;

/*
 * mft references (aka file references or file record segment references) are
 * used whenever a structure needs to refer to a record in the mft.
 *
 * A reference consists of a 48-bit index into the mft and a 16-bit sequence
 * number used to detect stale references.
 *
 * For error reporting purposes we treat the 48-bit index as a signed quantity.
 *
 * The sequence number is a circular counter (skipping 0) describing how many
 * times the referenced mft record has been (re)used. This has to match the
 * sequence number of the mft record being referenced, otherwise the reference
 * is considered stale and removed (FIXME: only ntfsck or the driver itself?).
 *
 * If the sequence number is zero it is assumed that no sequence number
 * consistency checking should be performed.
 *
 * FIXME: Since inodes are 32-bit as of now, the driver needs to always check
 * for high_part being 0 and if not either BUG(), cause a panic() or handle
 * the situation in some other way. This shouldn't be a problem as a volume has
 * to become HUGE in order to need more than 32-bits worth of mft records.
 * Assuming the standard mft record size of 1kb only the records (never mind
 * the non-resident attributes, etc.) would require 4Tb of space on their own
 * for the first 32 bits worth of records. This is only if some strange person
 * doesn't decide to foul play and make the mft sparse which would be a really
 * horrible thing to do as it would trash our current driver implementation. )-:
 * Do I hear screams "we want 64-bit inodes!" ?!? (-;
 *
 * FIXME: The mft zone is defined as the first 12% of the volume. This space is
 * reserved so that the mft can grow contiguously and hence doesn't become
 * fragmented. Volume free space includes the empty part of the mft zone and
 * when the volume's free 88% are used up, the mft zone is shrunk by a factor
 * of 2, thus making more space available for more files/data. This process is
 * repeated everytime there is no more free space except for the mft zone until
 * there really is no more free space.
 */

/*
 * Typedef the MFT_REF as a 64-bit value for easier handling.
 * Also define two unpacking macros to get to the reference (MREF) and
 * sequence number (MSEQNO) respectively.
 * The _LE versions are to be applied on little endian MFT_REFs.
 * Note: The _LE versions will return a CPU endian formatted value!
 */
#define MFT_REF_MASK_CPU 0x0000ffffffffffffULL
#define MFT_REF_MASK_LE const_cpu_to_le64(MFT_REF_MASK_CPU)

typedef u64 MFT_REF;
typedef le64 leMFT_REF;

#define MK_MREF(m, s)	((MFT_REF)(((MFT_REF)(s) << 48) |		\
					((MFT_REF)(m) & MFT_REF_MASK_CPU)))
#define MK_LE_MREF(m, s) cpu_to_le64(MK_MREF(m, s))

#define MREF(x)		((unsigned long)((x) & MFT_REF_MASK_CPU))
#define MSEQNO(x)	((u16)(((x) >> 48) & 0xffff))
#define MREF_LE(x)	((unsigned long)(le64_to_cpu(x) & MFT_REF_MASK_CPU))
#define MSEQNO_LE(x)	((u16)((le64_to_cpu(x) >> 48) & 0xffff))

#define IS_ERR_MREF(x)	(((x) & 0x0000800000000000ULL) ? 1 : 0)
#define ERR_MREF(x)	((u64)((s64)(x)))
#define MREF_ERR(x)	((int)((s64)(x)))

/*
 * The mft record header present at the beginning of every record in the mft.
 * This is followed by a sequence of variable length attribute records which
 * is terminated by an attribute of type AT_END which is a truncated attribute
 * in that it only consists of the attribute type code AT_END and none of the
 * other members of the attribute structure are present.
 */
typedef struct {
/*Ofs*/
/*  0	NTFS_RECORD; -- Unfolded here as gcc doesn't like unnamed structs. */
	NTFS_RECORD_TYPE magic;	/* Usually the magic is "FILE". */
	le16 usa_ofs;		/* See NTFS_RECORD definition above. */
	le16 usa_count;		/* See NTFS_RECORD definition above. */

/*  8*/	le64 lsn;		/* $LogFile sequence number for this record.
				   Changed every time the record is modified. */
/* 16*/	le16 sequence_number;	/* Number of times this mft record has been
				   reused. (See description for MFT_REF
				   above.) NOTE: The increment (skipping zero)
				   is done when the file is deleted. NOTE: If
				   this is zero it is left zero. */
/* 18*/	le16 link_count;	/* Number of hard links, i.e. the number of
				   directory entries referencing this record.
				   NOTE: Only used in mft base records.
				   NOTE: When deleting a directory entry we
				   check the link_count and if it is 1 we
				   delete the file. Otherwise we delete the
				   FILE_NAME_ATTR being referenced by the
				   directory entry from the mft record and
				   decrement the link_count.
				   FIXME: Careful with Win32 + DOS names! */
/* 20*/	le16 attrs_offset;	/* Byte offset to the first attribute in this
				   mft record from the start of the mft record.
				   NOTE: Must be aligned to 8-byte boundary. */
/* 22*/	MFT_RECORD_FLAGS flags;	/* Bit array of MFT_RECORD_FLAGS. When a file
				   is deleted, the MFT_RECORD_IN_USE flag is
				   set to zero. */
/* 24*/	le32 bytes_in_use;	/* Number of bytes used in this mft record.
				   NOTE: Must be aligned to 8-byte boundary. */
/* 28*/	le32 bytes_allocated;	/* Number of bytes allocated for this mft
				   record. This should be equal to the mft
				   record size. */
/* 32*/	leMFT_REF base_mft_record;/* This is zero for base mft records.
				   When it is not zero it is a mft reference
				   pointing to the base mft record to which
				   this record belongs (this is then used to
				   locate the attribute list attribute present
				   in the base record which describes this
				   extension record and hence might need
				   modification when the extension record
				   itself is modified, also locating the
				   attribute list also means finding the other
				   potential extents, belonging to the non-base
				   mft record). */
/* 40*/	le16 next_attr_instance;/* The instance number that will be assigned to
				   the next attribute added to this mft record.
				   NOTE: Incremented each time after it is used.
				   NOTE: Every time the mft record is reused
				   this number is set to zero.  NOTE: The first
				   instance number is always 0. */
/* The below fields are specific to NTFS 3.1+ (Windows XP and above): */
/* 42*/ le16 reserved;		/* Reserved/alignment. */
/* 44*/ le32 mft_record_number;	/* Number of this mft record. */
/* sizeof() = 48 bytes */
/*
 * When (re)using the mft record, we place the update sequence array at this
 * offset, i.e. before we start with the attributes.  This also makes sense,
 * otherwise we could run into problems with the update sequence array
 * containing in itself the last two bytes of a sector which would mean that
 * multi sector transfer protection wouldn't work.  As you can't protect data
 * by overwriting it since you then can't get it back...
 * When reading we obviously use the data from the ntfs record header.
 */
} __attribute__ ((__packed__)) MFT_RECORD;

/* This is the version without the NTFS 3.1+ specific fields. */
typedef struct {
/*Ofs*/
/*  0	NTFS_RECORD; -- Unfolded here as gcc doesn't like unnamed structs. */
	NTFS_RECORD_TYPE magic;	/* Usually the magic is "FILE". */
	le16 usa_ofs;		/* See NTFS_RECORD definition above. */
	le16 usa_count;		/* See NTFS_RECORD definition above. */

/*  8*/	le64 lsn;		/* $LogFile sequence number for this record.
				   Changed every time the record is modified. */
/* 16*/	le16 sequence_number;	/* Number of times this mft record has been
				   reused. (See description for MFT_REF
				   above.) NOTE: The increment (skipping zero)
				   is done when the file is deleted. NOTE: If
				   this is zero it is left zero. */
/* 18*/	le16 link_count;	/* Number of hard links, i.e. the number of
				   directory entries referencing this record.
				   NOTE: Only used in mft base records.
				   NOTE: When deleting a directory entry we
				   check the link_count and if it is 1 we
				   delete the file. Otherwise we delete the
				   FILE_NAME_ATTR being referenced by the
				   directory entry from the mft record and
				   decrement the link_count.
				   FIXME: Careful with Win32 + DOS names! */
/* 20*/	le16 attrs_offset;	/* Byte offset to the first attribute in this
				   mft record from the start of the mft record.
				   NOTE: Must be aligned to 8-byte boundary. */
/* 22*/	MFT_RECORD_FLAGS flags;	/* Bit array of MFT_RECORD_FLAGS. When a file
				   is deleted, the MFT_RECORD_IN_USE flag is
				   set to zero. */
/* 24*/	le32 bytes_in_use;	/* Number of bytes used in this mft record.
				   NOTE: Must be aligned to 8-byte boundary. */
/* 28*/	le32 bytes_allocated;	/* Number of bytes allocated for this mft
				   record. This should be equal to the mft
				   record size. */
/* 32*/	leMFT_REF base_mft_record;/* This is zero for base mft records.
				   When it is not zero it is a mft reference
				   pointing to the base mft record to which
				   this record belongs (this is then used to
				   locate the attribute list attribute present
				   in the base record which describes this
				   extension record and hence might need
				   modification when the extension record
				   itself is modified, also locating the
				   attribute list also means finding the other
				   potential extents, belonging to the non-base
				   mft record). */
/* 40*/	le16 next_attr_instance;/* The instance number that will be assigned to
				   the next attribute added to this mft record.
				   NOTE: Incremented each time after it is used.
				   NOTE: Every time the mft record is reused
				   this number is set to zero.  NOTE: The first
				   instance number is always 0. */
/* sizeof() = 42 bytes */
/*
 * When (re)using the mft record, we place the update sequence array at this
 * offset, i.e. before we start with the attributes.  This also makes sense,
 * otherwise we could run into problems with the update sequence array
 * containing in itself the last two bytes of a sector which would mean that
 * multi sector transfer protection wouldn't work.  As you can't protect data
 * by overwriting it since you then can't get it back...
 * When reading we obviously use the data from the ntfs record header.
 */
} __attribute__ ((__packed__)) MFT_RECORD_OLD;

/*
 * System defined attributes (32-bit).  Each attribute type has a corresponding
 * attribute name (Unicode string of maximum 64 character length) as described
 * by the attribute definitions present in the data attribute of the $AttrDef
 * system file.  On NTFS 3.0 volumes the names are just as the types are named
 * in the below defines exchanging AT_ for the dollar sign ($).  If that is not
 * a revealing choice of symbol I do not know what is... (-;
 */
enum {
	AT_UNUSED			= const_cpu_to_le32(         0),
	AT_STANDARD_INFORMATION		= const_cpu_to_le32(      0x10),
	AT_ATTRIBUTE_LIST		= const_cpu_to_le32(      0x20),
	AT_FILE_NAME			= const_cpu_to_le32(      0x30),
	AT_OBJECT_ID			= const_cpu_to_le32(      0x40),
	AT_SECURITY_DESCRIPTOR		= const_cpu_to_le32(      0x50),
	AT_VOLUME_NAME			= const_cpu_to_le32(      0x60),
	AT_VOLUME_INFORMATION		= const_cpu_to_le32(      0x70),
	AT_DATA				= const_cpu_to_le32(      0x80),
	AT_INDEX_ROOT			= const_cpu_to_le32(      0x90),
	AT_INDEX_ALLOCATION		= const_cpu_to_le32(      0xa0),
	AT_BITMAP			= const_cpu_to_le32(      0xb0),
	AT_REPARSE_POINT		= const_cpu_to_le32(      0xc0),
	AT_EA_INFORMATION		= const_cpu_to_le32(      0xd0),
	AT_EA				= const_cpu_to_le32(      0xe0),
	AT_PROPERTY_SET			= const_cpu_to_le32(      0xf0),
	AT_LOGGED_UTILITY_STREAM	= const_cpu_to_le32(     0x100),
	AT_FIRST_USER_DEFINED_ATTRIBUTE	= const_cpu_to_le32(    0x1000),
	AT_END				= const_cpu_to_le32(0xffffffff)
};

typedef le32 ATTR_TYPE;

/*
 * The collation rules for sorting views/indexes/etc (32-bit).
 *
 * COLLATION_BINARY - Collate by binary compare where the first byte is most
 *	significant.
 * COLLATION_UNICODE_STRING - Collate Unicode strings by comparing their binary
 *	Unicode values, except that when a character can be uppercased, the
 *	upper case value collates before the lower case one.
 * COLLATION_FILE_NAME - Collate file names as Unicode strings. The collation
 *	is done very much like COLLATION_UNICODE_STRING. In fact I have no idea
 *	what the difference is. Perhaps the difference is that file names
 *	would treat some special characters in an odd way (see
 *	unistr.c::ntfs_collate_names() and unistr.c::legal_ansi_char_array[]
 *	for what I mean but COLLATION_UNICODE_STRING would not give any special
 *	treatment to any characters at all, but this is speculation.
 * COLLATION_NTOFS_ULONG - Sorting is done according to ascending le32 key
 *	values. E.g. used for $SII index in FILE_Secure, which sorts by
 *	security_id (le32).
 * COLLATION_NTOFS_SID - Sorting is done according to ascending SID values.
 *	E.g. used for $O index in FILE_Extend/$Quota.
 * COLLATION_NTOFS_SECURITY_HASH - Sorting is done first by ascending hash
 *	values and second by ascending security_id values. E.g. used for $SDH
 *	index in FILE_Secure.
 * COLLATION_NTOFS_ULONGS - Sorting is done according to a sequence of ascending
 *	le32 key values. E.g. used for $O index in FILE_Extend/$ObjId, which
 *	sorts by object_id (16-byte), by splitting up the object_id in four
 *	le32 values and using them as individual keys. E.g. take the following
 *	two security_ids, stored as follows on disk:
 *		1st: a1 61 65 b7 65 7b d4 11 9e 3d 00 e0 81 10 42 59
 *		2nd: 38 14 37 d2 d2 f3 d4 11 a5 21 c8 6b 79 b1 97 45
 *	To compare them, they are split into four le32 values each, like so:
 *		1st: 0xb76561a1 0x11d47b65 0xe0003d9e 0x59421081
 *		2nd: 0xd2371438 0x11d4f3d2 0x6bc821a5 0x4597b179
 *	Now, it is apparent why the 2nd object_id collates after the 1st: the
 *	first le32 value of the 1st object_id is less than the first le32 of
 *	the 2nd object_id. If the first le32 values of both object_ids were
 *	equal then the second le32 values would be compared, etc.
 */
enum {
	COLLATION_BINARY		= const_cpu_to_le32(0x00),
	COLLATION_FILE_NAME		= const_cpu_to_le32(0x01),
	COLLATION_UNICODE_STRING	= const_cpu_to_le32(0x02),
	COLLATION_NTOFS_ULONG		= const_cpu_to_le32(0x10),
	COLLATION_NTOFS_SID		= const_cpu_to_le32(0x11),
	COLLATION_NTOFS_SECURITY_HASH	= const_cpu_to_le32(0x12),
	COLLATION_NTOFS_ULONGS		= const_cpu_to_le32(0x13),
};

typedef le32 COLLATION_RULE;

/*
 * The flags (32-bit) describing attribute properties in the attribute
 * definition structure.  FIXME: This information is based on Regis's
 * information and, according to him, it is not certain and probably
 * incomplete.  The INDEXABLE flag is fairly certainly correct as only the file
 * name attribute has this flag set and this is the only attribute indexed in
 * NT4.
 */
enum {
	ATTR_DEF_INDEXABLE	= const_cpu_to_le32(0x02), /* Attribute can be
					indexed. */
	ATTR_DEF_MULTIPLE	= const_cpu_to_le32(0x04), /* Attribute type
					can be present multiple times in the
					mft records of an inode. */
	ATTR_DEF_NOT_ZERO	= const_cpu_to_le32(0x08), /* Attribute value
					must contain at least one non-zero
					byte. */
	ATTR_DEF_INDEXED_UNIQUE	= const_cpu_to_le32(0x10), /* Attribute must be
					indexed and the attribute value must be
					unique for the attribute type in all of
					the mft records of an inode. */
	ATTR_DEF_NAMED_UNIQUE	= const_cpu_to_le32(0x20), /* Attribute must be
					named and the name must be unique for
					the attribute type in all of the mft
					records of an inode. */
	ATTR_DEF_RESIDENT	= const_cpu_to_le32(0x40), /* Attribute must be
					resident. */
	ATTR_DEF_ALWAYS_LOG	= const_cpu_to_le32(0x80), /* Always log
					modifications to this attribute,
					regardless of whether it is resident or
					non-resident.  Without this, only log
					modifications if the attribute is
					resident. */
};

typedef le32 ATTR_DEF_FLAGS;

/*
 * The data attribute of FILE_AttrDef contains a sequence of attribute
 * definitions for the NTFS volume. With this, it is supposed to be safe for an
 * older NTFS driver to mount a volume containing a newer NTFS version without
 * damaging it (that's the theory. In practice it's: not damaging it too much).
 * Entries are sorted by attribute type. The flags describe whether the
 * attribute can be resident/non-resident and possibly other things, but the
 * actual bits are unknown.
 */
typedef struct {
/*hex ofs*/
/*  0*/	ntfschar name[0x40];		/* Unicode name of the attribute. Zero
					   terminated. */
/* 80*/	ATTR_TYPE type;			/* Type of the attribute. */
/* 84*/	le32 display_rule;		/* Default display rule.
					   FIXME: What does it mean? (AIA) */
/* 88*/ COLLATION_RULE collation_rule;	/* Default collation rule. */
/* 8c*/	ATTR_DEF_FLAGS flags;		/* Flags describing the attribute. */
/* 90*/	sle64 min_size;			/* Optional minimum attribute size. */
/* 98*/	sle64 max_size;			/* Maximum size of attribute. */
/* sizeof() = 0xa0 or 160 bytes */
} __attribute__ ((__packed__)) ATTR_DEF;

/*
 * Attribute flags (16-bit).
 */
enum {
	ATTR_IS_COMPRESSED    = const_cpu_to_le16(0x0001),
	ATTR_COMPRESSION_MASK = const_cpu_to_le16(0x00ff), /* Compression method
							      mask.  Also, first
							      illegal value. */
	ATTR_IS_ENCRYPTED     = const_cpu_to_le16(0x4000),
	ATTR_IS_SPARSE	      = const_cpu_to_le16(0x8000),
} __attribute__ ((__packed__));

typedef le16 ATTR_FLAGS;

/*
 * Attribute compression.
 *
 * Only the data attribute is ever compressed in the current ntfs driver in
 * Windows. Further, compression is only applied when the data attribute is
 * non-resident. Finally, to use compression, the maximum allowed cluster size
 * on a volume is 4kib.
 *
 * The compression method is based on independently compressing blocks of X
 * clusters, where X is determined from the compression_unit value found in the
 * non-resident attribute record header (more precisely: X = 2^compression_unit
 * clusters). On Windows NT/2k, X always is 16 clusters (compression_unit = 4).
 *
 * There are three different cases of how a compression block of X clusters
 * can be stored:
 *
 *   1) The data in the block is all zero (a sparse block):
 *	  This is stored as a sparse block in the runlist, i.e. the runlist
 *	  entry has length = X and lcn = -1. The mapping pairs array actually
 *	  uses a delta_lcn value length of 0, i.e. delta_lcn is not present at
 *	  all, which is then interpreted by the driver as lcn = -1.
 *	  NOTE: Even uncompressed files can be sparse on NTFS 3.0 volumes, then
 *	  the same principles apply as above, except that the length is not
 *	  restricted to being any particular value.
 *
 *   2) The data in the block is not compressed:
 *	  This happens when compression doesn't reduce the size of the block
 *	  in clusters. I.e. if compression has a small effect so that the
 *	  compressed data still occupies X clusters, then the uncompressed data
 *	  is stored in the block.
 *	  This case is recognised by the fact that the runlist entry has
 *	  length = X and lcn >= 0. The mapping pairs array stores this as
 *	  normal with a run length of X and some specific delta_lcn, i.e.
 *	  delta_lcn has to be present.
 *
 *   3) The data in the block is compressed:
 *	  The common case. This case is recognised by the fact that the run
 *	  list entry has length L < X and lcn >= 0. The mapping pairs array
 *	  stores this as normal with a run length of X and some specific
 *	  delta_lcn, i.e. delta_lcn has to be present. This runlist entry is
 *	  immediately followed by a sparse entry with length = X - L and
 *	  lcn = -1. The latter entry is to make up the vcn counting to the
 *	  full compression block size X.
 *
 * In fact, life is more complicated because adjacent entries of the same type
 * can be coalesced. This means that one has to keep track of the number of
 * clusters handled and work on a basis of X clusters at a time being one
 * block. An example: if length L > X this means that this particular runlist
 * entry contains a block of length X and part of one or more blocks of length
 * L - X. Another example: if length L < X, this does not necessarily mean that
 * the block is compressed as it might be that the lcn changes inside the block
 * and hence the following runlist entry describes the continuation of the
 * potentially compressed block. The block would be compressed if the
 * following runlist entry describes at least X - L sparse clusters, thus
 * making up the compression block length as described in point 3 above. (Of
 * course, there can be several runlist entries with small lengths so that the
 * sparse entry does not follow the first data containing entry with
 * length < X.)
 *
 * NOTE: At the end of the compressed attribute value, there most likely is not
 * just the right amount of data to make up a compression block, thus this data
 * is not even attempted to be compressed. It is just stored as is, unless
 * the number of clusters it occupies is reduced when compressed in which case
 * it is stored as a compressed compression block, complete with sparse
 * clusters at the end.
 */

/*
 * Flags of resident attributes (8-bit).
 */
enum {
	RESIDENT_ATTR_IS_INDEXED = 0x01, /* Attribute is referenced in an index
					    (has implications for deleting and
					    modifying the attribute). */
} __attribute__ ((__packed__));

typedef u8 RESIDENT_ATTR_FLAGS;

/*
 * Attribute record header. Always aligned to 8-byte boundary.
 */
typedef struct {
/*Ofs*/
/*  0*/	ATTR_TYPE type;		/* The (32-bit) type of the attribute. */
/*  4*/	le32 length;		/* Byte size of the resident part of the
				   attribute (aligned to 8-byte boundary).
				   Used to get to the next attribute. */
/*  8*/	u8 non_resident;	/* If 0, attribute is resident.
				   If 1, attribute is non-resident. */
/*  9*/	u8 name_length;		/* Unicode character size of name of attribute.
				   0 if unnamed. */
/* 10*/	le16 name_offset;	/* If name_length != 0, the byte offset to the
				   beginning of the name from the attribute
				   record. Note that the name is stored as a
				   Unicode string. When creating, place offset
				   just at the end of the record header. Then,
				   follow with attribute value or mapping pairs
				   array, resident and non-resident attributes
				   respectively, aligning to an 8-byte
				   boundary. */
/* 12*/	ATTR_FLAGS flags;	/* Flags describing the attribute. */
/* 14*/	le16 instance;		/* The instance of this attribute record. This
				   number is unique within this mft record (see
				   MFT_RECORD/next_attribute_instance notes in
				   in mft.h for more details). */
/* 16*/	union {
		/* Resident attributes. */
		struct {
/* 16 */		le32 value_length;/* Byte size of attribute value. */
/* 20 */		le16 value_offset;/* Byte offset of the attribute
					     value from the start of the
					     attribute record. When creating,
					     align to 8-byte boundary if we
					     have a name present as this might
					     not have a length of a multiple
					     of 8-bytes. */
/* 22 */		RESIDENT_ATTR_FLAGS flags; /* See above. */
/* 23 */		s8 reserved;	  /* Reserved/alignment to 8-byte
					     boundary. */
		} __attribute__ ((__packed__)) resident;
		/* Non-resident attributes. */
		struct {
/* 16*/			leVCN lowest_vcn;/* Lowest valid virtual cluster number
				for this portion of the attribute value or
				0 if this is the only extent (usually the
				case). - Only when an attribute list is used
				does lowest_vcn != 0 ever occur. */
/* 24*/			leVCN highest_vcn;/* Highest valid vcn of this extent of
				the attribute value. - Usually there is only one
				portion, so this usually equals the attribute
				value size in clusters minus 1. Can be -1 for
				zero length files. Can be 0 for "single extent"
				attributes. */
/* 32*/			le16 mapping_pairs_offset; /* Byte offset from the
				beginning of the structure to the mapping pairs
				array which contains the mappings between the
				vcns and the logical cluster numbers (lcns).
				When creating, place this at the end of this
				record header aligned to 8-byte boundary. */
/* 34*/			u8 compression_unit; /* The compression unit expressed
				as the log to the base 2 of the number of
				clusters in a compression unit.  0 means not
				compressed.  (This effectively limits the
				compression unit size to be a power of two
				clusters.)  WinNT4 only uses a value of 4.
				Sparse files also have this set to 4. */
/* 35*/			u8 reserved[5];		/* Align to 8-byte boundary. */
/* The sizes below are only used when lowest_vcn is zero, as otherwise it would
   be difficult to keep them up-to-date.*/
/* 40*/			sle64 allocated_size;	/* Byte size of disk space
				allocated to hold the attribute value. Always
				is a multiple of the cluster size. When a file
				is compressed, this field is a multiple of the
				compression block size (2^compression_unit) and
				it represents the logically allocated space
				rather than the actual on disk usage. For this
				use the compressed_size (see below). */
/* 48*/			sle64 data_size;	/* Byte size of the attribute
				value. Can be larger than allocated_size if
				attribute value is compressed or sparse. */
/* 56*/			sle64 initialized_size;	/* Byte size of initialized
				portion of the attribute value. Usually equals
				data_size. */
/* sizeof(uncompressed attr) = 64*/
/* 64*/			sle64 compressed_size;	/* Byte size of the attribute
				value after compression.  Only present when
				compressed or sparse.  Always is a multiple of
				the cluster size.  Represents the actual amount
				of disk space being used on the disk. */
/* sizeof(compressed attr) = 72*/
		} __attribute__ ((__packed__)) non_resident;
	} __attribute__ ((__packed__)) data;
} __attribute__ ((__packed__)) ATTR_RECORD;

typedef ATTR_RECORD ATTR_REC;

/*
 * File attribute flags (32-bit).
 */
enum {
	/*
	 * The following flags are only present in the STANDARD_INFORMATION
	 * attribute (in the field file_attributes).
	 */
	FILE_ATTR_READONLY		= const_cpu_to_le32(0x00000001),
	FILE_ATTR_HIDDEN		= const_cpu_to_le32(0x00000002),
	FILE_ATTR_SYSTEM		= const_cpu_to_le32(0x00000004),
	/* Old DOS volid. Unused in NT.	= const_cpu_to_le32(0x00000008), */

	FILE_ATTR_DIRECTORY		= const_cpu_to_le32(0x00000010),
	/* Note, FILE_ATTR_DIRECTORY is not considered valid in NT.  It is
	   reserved for the DOS SUBDIRECTORY flag. */
	FILE_ATTR_ARCHIVE		= const_cpu_to_le32(0x00000020),
	FILE_ATTR_DEVICE		= const_cpu_to_le32(0x00000040),
	FILE_ATTR_NORMAL		= const_cpu_to_le32(0x00000080),

	FILE_ATTR_TEMPORARY		= const_cpu_to_le32(0x00000100),
	FILE_ATTR_SPARSE_FILE		= const_cpu_to_le32(0x00000200),
	FILE_ATTR_REPARSE_POINT		= const_cpu_to_le32(0x00000400),
	FILE_ATTR_COMPRESSED		= const_cpu_to_le32(0x00000800),

	FILE_ATTR_OFFLINE		= const_cpu_to_le32(0x00001000),
	FILE_ATTR_NOT_CONTENT_INDEXED	= const_cpu_to_le32(0x00002000),
	FILE_ATTR_ENCRYPTED		= const_cpu_to_le32(0x00004000),

	FILE_ATTR_VALID_FLAGS		= const_cpu_to_le32(0x00007fb7),
	/* Note, FILE_ATTR_VALID_FLAGS masks out the old DOS VolId and the
	   FILE_ATTR_DEVICE and preserves everything else.  This mask is used
	   to obtain all flags that are valid for reading. */
	FILE_ATTR_VALID_SET_FLAGS	= const_cpu_to_le32(0x000031a7),
	/* Note, FILE_ATTR_VALID_SET_FLAGS masks out the old DOS VolId, the
	   F_A_DEVICE, F_A_DIRECTORY, F_A_SPARSE_FILE, F_A_REPARSE_POINT,
	   F_A_COMPRESSED, and F_A_ENCRYPTED and preserves the rest.  This mask
	   is used to to obtain all flags that are valid for setting. */

	/*
	 * The following flags are only present in the FILE_NAME attribute (in
	 * the field file_attributes).
	 */
	FILE_ATTR_DUP_FILE_NAME_INDEX_PRESENT	= const_cpu_to_le32(0x10000000),
	/* Note, this is a copy of the corresponding bit from the mft record,
	   telling us whether this is a directory or not, i.e. whether it has
	   an index root attribute or not. */
	FILE_ATTR_DUP_VIEW_INDEX_PRESENT	= const_cpu_to_le32(0x20000000),
	/* Note, this is a copy of the corresponding bit from the mft record,
	   telling us whether this file has a view index present (eg. object id
	   index, quota index, one of the security indexes or the encrypting
	   filesystem related indexes). */
};

typedef le32 FILE_ATTR_FLAGS;

/*
 * NOTE on times in NTFS: All times are in MS standard time format, i.e. they
 * are the number of 100-nanosecond intervals since 1st January 1601, 00:00:00
 * universal coordinated time (UTC). (In Linux time starts 1st January 1970,
 * 00:00:00 UTC and is stored as the number of 1-second intervals since then.)
 */

/*
 * Attribute: Standard information (0x10).
 *
 * NOTE: Always resident.
 * NOTE: Present in all base file records on a volume.
 * NOTE: There is conflicting information about the meaning of each of the time
 *	 fields but the meaning as defined below has been verified to be
 *	 correct by practical experimentation on Windows NT4 SP6a and is hence
 *	 assumed to be the one and only correct interpretation.
 */
typedef struct {
/*Ofs*/
/*  0*/	sle64 creation_time;		/* Time file was created. Updated when
					   a filename is changed(?). */
/*  8*/	sle64 last_data_change_time;	/* Time the data attribute was last
					   modified. */
/* 16*/	sle64 last_mft_change_time;	/* Time this mft record was last
					   modified. */
/* 24*/	sle64 last_access_time;		/* Approximate time when the file was
					   last accessed (obviously this is not
					   updated on read-only volumes). In
					   Windows this is only updated when
					   accessed if some time delta has
					   passed since the last update. Also,
					   last access times updates can be
					   disabled altogether for speed. */
/* 32*/	FILE_ATTR_FLAGS file_attributes; /* Flags describing the file. */
/* 36*/	union {
	/* NTFS 1.2 */
		struct {
		/* 36*/	u8 reserved12[12];	/* Reserved/alignment to 8-byte
						   boundary. */
		} __attribute__ ((__packed__)) v1;
	/* sizeof() = 48 bytes */
	/* NTFS 3.x */
		struct {
/*
 * If a volume has been upgraded from a previous NTFS version, then these
 * fields are present only if the file has been accessed since the upgrade.
 * Recognize the difference by comparing the length of the resident attribute
 * value. If it is 48, then the following fields are missing. If it is 72 then
 * the fields are present. Maybe just check like this:
 *	if (resident.ValueLength < sizeof(STANDARD_INFORMATION)) {
 *		Assume NTFS 1.2- format.
 *		If (volume version is 3.x)
 *			Upgrade attribute to NTFS 3.x format.
 *		else
 *			Use NTFS 1.2- format for access.
 *	} else
 *		Use NTFS 3.x format for access.
 * Only problem is that it might be legal to set the length of the value to
 * arbitrarily large values thus spoiling this check. - But chkdsk probably
 * views that as a corruption, assuming that it behaves like this for all
 * attributes.
 */
		/* 36*/	le32 maximum_versions;	/* Maximum allowed versions for
				file. Zero if version numbering is disabled. */
		/* 40*/	le32 version_number;	/* This file's version (if any).
				Set to zero if maximum_versions is zero. */
		/* 44*/	le32 class_id;		/* Class id from bidirectional
				class id index (?). */
		/* 48*/	le32 owner_id;		/* Owner_id of the user owning
				the file. Translate via $Q index in FILE_Extend
				/$Quota to the quota control entry for the user
				owning the file. Zero if quotas are disabled. */
		/* 52*/	le32 security_id;	/* Security_id for the file.
				Translate via $SII index and $SDS data stream
				in FILE_Secure to the security descriptor. */
		/* 56*/	le64 quota_charged;	/* Byte size of the charge to
				the quota for all streams of the file. Note: Is
				zero if quotas are disabled. */
		/* 64*/	leUSN usn;		/* Last update sequence number
				of the file.  This is a direct index into the
				transaction log file ($UsnJrnl).  It is zero if
				the usn journal is disabled or this file has
				not been subject to logging yet.  See usnjrnl.h
				for details. */
		} __attribute__ ((__packed__)) v3;
	/* sizeof() = 72 bytes (NTFS 3.x) */
	} __attribute__ ((__packed__)) ver;
} __attribute__ ((__packed__)) STANDARD_INFORMATION;

/*
 * Attribute: Attribute list (0x20).
 *
 * - Can be either resident or non-resident.
 * - Value consists of a sequence of variable length, 8-byte aligned,
 * ATTR_LIST_ENTRY records.
 * - The list is not terminated by anything at all! The only way to know when
 * the end is reached is to keep track of the current offset and compare it to
 * the attribute value size.
 * - The attribute list attribute contains one entry for each attribute of
 * the file in which the list is located, except for the list attribute
 * itself. The list is sorted: first by attribute type, second by attribute
 * name (if present), third by instance number. The extents of one
 * non-resident attribute (if present) immediately follow after the initial
 * extent. They are ordered by lowest_vcn and have their instace set to zero.
 * It is not allowed to have two attributes with all sorting keys equal.
 * - Further restrictions:
 *	- If not resident, the vcn to lcn mapping array has to fit inside the
 *	  base mft record.
 *	- The attribute list attribute value has a maximum size of 256kb. This
 *	  is imposed by the Windows cache manager.
 * - Attribute lists are only used when the attributes of mft record do not
 * fit inside the mft record despite all attributes (that can be made
 * non-resident) having been made non-resident. This can happen e.g. when:
 *	- File has a large number of hard links (lots of file name
 *	  attributes present).
 *	- The mapping pairs array of some non-resident attribute becomes so
 *	  large due to fragmentation that it overflows the mft record.
 *	- The security descriptor is very complex (not applicable to
 *	  NTFS 3.0 volumes).
 *	- There are many named streams.
 */
typedef struct {
/*Ofs*/
/*  0*/	ATTR_TYPE type;		/* Type of referenced attribute. */
/*  4*/	le16 length;		/* Byte size of this entry (8-byte aligned). */
/*  6*/	u8 name_length;		/* Size in Unicode chars of the name of the
				   attribute or 0 if unnamed. */
/*  7*/	u8 name_offset;		/* Byte offset to beginning of attribute name
				   (always set this to where the name would
				   start even if unnamed). */
/*  8*/	leVCN lowest_vcn;	/* Lowest virtual cluster number of this portion
				   of the attribute value. This is usually 0. It
				   is non-zero for the case where one attribute
				   does not fit into one mft record and thus
				   several mft records are allocated to hold
				   this attribute. In the latter case, each mft
				   record holds one extent of the attribute and
				   there is one attribute list entry for each
				   extent. NOTE: This is DEFINITELY a signed
				   value! The windows driver uses cmp, followed
				   by jg when comparing this, thus it treats it
				   as signed. */
/* 16*/	leMFT_REF mft_reference;/* The reference of the mft record holding
				   the ATTR_RECORD for this portion of the
				   attribute value. */
/* 24*/	le16 instance;		/* If lowest_vcn = 0, the instance of the
				   attribute being referenced; otherwise 0. */
/* 26*/	ntfschar name[0];	/* Use when creating only. When reading use
				   name_offset to determine the location of the
				   name. */
/* sizeof() = 26 + (attribute_name_length * 2) bytes */
} __attribute__ ((__packed__)) ATTR_LIST_ENTRY;

/*
 * The maximum allowed length for a file name.
 */
#define MAXIMUM_FILE_NAME_LENGTH	255

/*
 * Possible namespaces for filenames in ntfs (8-bit).
 */
enum {
	FILE_NAME_POSIX		= 0x00,
	/* This is the largest namespace. It is case sensitive and allows all
	   Unicode characters except for: '\0' and '/'.  Beware that in
	   WinNT/2k files which eg have the same name except for their case
	   will not be distinguished by the standard utilities and thus a "del
	   filename" will delete both "filename" and "fileName" without
	   warning. */
	FILE_NAME_WIN32		= 0x01,
	/* The standard WinNT/2k NTFS long filenames. Case insensitive.  All
	   Unicode chars except: '\0', '"', '*', '/', ':', '<', '>', '?', '\',
	   and '|'.  Further, names cannot end with a '.' or a space. */
	FILE_NAME_DOS		= 0x02,
	/* The standard DOS filenames (8.3 format). Uppercase only.  All 8-bit
	   characters greater space, except: '"', '*', '+', ',', '/', ':', ';',
	   '<', '=', '>', '?', and '\'. */
	FILE_NAME_WIN32_AND_DOS	= 0x03,
	/* 3 means that both the Win32 and the DOS filenames are identical and
	   hence have been saved in this single filename record. */
} __attribute__ ((__packed__));

typedef u8 FILE_NAME_TYPE_FLAGS;

/*
 * Attribute: Filename (0x30).
 *
 * NOTE: Always resident.
 * NOTE: All fields, except the parent_directory, are only updated when the
 *	 filename is changed. Until then, they just become out of sync with
 *	 reality and the more up to date values are present in the standard
 *	 information attribute.
 * NOTE: There is conflicting information about the meaning of each of the time
 *	 fields but the meaning as defined below has been verified to be
 *	 correct by practical experimentation on Windows NT4 SP6a and is hence
 *	 assumed to be the one and only correct interpretation.
 */
typedef struct {
/*hex ofs*/
/*  0*/	leMFT_REF parent_directory;	/* Directory this filename is
					   referenced from. */
/*  8*/	sle64 creation_time;		/* Time file was created. */
/* 10*/	sle64 last_data_change_time;	/* Time the data attribute was last
					   modified. */
/* 18*/	sle64 last_mft_change_time;	/* Time this mft record was last
					   modified. */
/* 20*/	sle64 last_access_time;		/* Time this mft record was last
					   accessed. */
/* 28*/	sle64 allocated_size;		/* Byte size of allocated space for the
					   data attribute. NOTE: Is a multiple
					   of the cluster size. */
/* 30*/	sle64 data_size;		/* Byte size of actual data in data
					   attribute. */
/* 38*/	FILE_ATTR_FLAGS file_attributes;	/* Flags describing the file. */
/* 3c*/	union {
	/* 3c*/	struct {
		/* 3c*/	le16 packed_ea_size;	/* Size of the buffer needed to
						   pack the extended attributes
						   (EAs), if such are present.*/
		/* 3e*/	le16 reserved;		/* Reserved for alignment. */
		} __attribute__ ((__packed__)) ea;
	/* 3c*/	struct {
		/* 3c*/	le32 reparse_point_tag;	/* Type of reparse point,
						   present only in reparse
						   points and only if there are
						   no EAs. */
		} __attribute__ ((__packed__)) rp;
	} __attribute__ ((__packed__)) type;
/* 40*/	u8 file_name_length;			/* Length of file name in
						   (Unicode) characters. */
/* 41*/	FILE_NAME_TYPE_FLAGS file_name_type;	/* Namespace of the file name.*/
/* 42*/	ntfschar file_name[0];			/* File name in Unicode. */
} __attribute__ ((__packed__)) FILE_NAME_ATTR;

/*
 * GUID structures store globally unique identifiers (GUID). A GUID is a
 * 128-bit value consisting of one group of eight hexadecimal digits, followed
 * by three groups of four hexadecimal digits each, followed by one group of
 * twelve hexadecimal digits. GUIDs are Microsoft's implementation of the
 * distributed computing environment (DCE) universally unique identifier (UUID).
 * Example of a GUID:
 *	1F010768-5A73-BC91-0010A52216A7
 */
typedef struct {
	le32 data1;	/* The first eight hexadecimal digits of the GUID. */
	le16 data2;	/* The first group of four hexadecimal digits. */
	le16 data3;	/* The second group of four hexadecimal digits. */
	u8 data4[8];	/* The first two bytes are the third group of four
			   hexadecimal digits. The remaining six bytes are the
			   final 12 hexadecimal digits. */
} __attribute__ ((__packed__)) GUID;

/*
 * FILE_Extend/$ObjId contains an index named $O. This index contains all
 * object_ids present on the volume as the index keys and the corresponding
 * mft_record numbers as the index entry data parts. The data part (defined
 * below) also contains three other object_ids:
 *	birth_volume_id - object_id of FILE_Volume on which the file was first
 *			  created. Optional (i.e. can be zero).
 *	birth_object_id - object_id of file when it was first created. Usually
 *			  equals the object_id. Optional (i.e. can be zero).
 *	domain_id	- Reserved (always zero).
 */
typedef struct {
	leMFT_REF mft_reference;/* Mft record containing the object_id in
				   the index entry key. */
	union {
		struct {
			GUID birth_volume_id;
			GUID birth_object_id;
			GUID domain_id;
		} __attribute__ ((__packed__)) origin;
		u8 extended_info[48];
	} __attribute__ ((__packed__)) opt;
} __attribute__ ((__packed__)) OBJ_ID_INDEX_DATA;

/*
 * Attribute: Object id (NTFS 3.0+) (0x40).
 *
 * NOTE: Always resident.
 */
typedef struct {
	GUID object_id;				/* Unique id assigned to the
						   file.*/
	/* The following fields are optional. The attribute value size is 16
	   bytes, i.e. sizeof(GUID), if these are not present at all. Note,
	   the entries can be present but one or more (or all) can be zero
	   meaning that that particular value(s) is(are) not defined. */
	union {
		struct {
			GUID birth_volume_id;	/* Unique id of volume on which
						   the file was first created.*/
			GUID birth_object_id;	/* Unique id of file when it was
						   first created. */
			GUID domain_id;		/* Reserved, zero. */
		} __attribute__ ((__packed__)) origin;
		u8 extended_info[48];
	} __attribute__ ((__packed__)) opt;
} __attribute__ ((__packed__)) OBJECT_ID_ATTR;

/*
 * The pre-defined IDENTIFIER_AUTHORITIES used as SID_IDENTIFIER_AUTHORITY in
 * the SID structure (see below).
 */
//typedef enum {					/* SID string prefix. */
//	SECURITY_NULL_SID_AUTHORITY	= {0, 0, 0, 0, 0, 0},	/* S-1-0 */
//	SECURITY_WORLD_SID_AUTHORITY	= {0, 0, 0, 0, 0, 1},	/* S-1-1 */
//	SECURITY_LOCAL_SID_AUTHORITY	= {0, 0, 0, 0, 0, 2},	/* S-1-2 */
//	SECURITY_CREATOR_SID_AUTHORITY	= {0, 0, 0, 0, 0, 3},	/* S-1-3 */
//	SECURITY_NON_UNIQUE_AUTHORITY	= {0, 0, 0, 0, 0, 4},	/* S-1-4 */
//	SECURITY_NT_SID_AUTHORITY	= {0, 0, 0, 0, 0, 5},	/* S-1-5 */
//} IDENTIFIER_AUTHORITIES;

/*
 * These relative identifiers (RIDs) are used with the above identifier
 * authorities to make up universal well-known SIDs.
 *
 * Note: The relative identifier (RID) refers to the portion of a SID, which
 * identifies a user or group in relation to the authority that issued the SID.
 * For example, the universal well-known SID Creator Owner ID (S-1-3-0) is
 * made up of the identifier authority SECURITY_CREATOR_SID_AUTHORITY (3) and
 * the relative identifier SECURITY_CREATOR_OWNER_RID (0).
 */
typedef enum {					/* Identifier authority. */
	SECURITY_NULL_RID		  = 0,	/* S-1-0 */
	SECURITY_WORLD_RID		  = 0,	/* S-1-1 */
	SECURITY_LOCAL_RID		  = 0,	/* S-1-2 */

	SECURITY_CREATOR_OWNER_RID	  = 0,	/* S-1-3 */
	SECURITY_CREATOR_GROUP_RID	  = 1,	/* S-1-3 */

	SECURITY_CREATOR_OWNER_SERVER_RID = 2,	/* S-1-3 */
	SECURITY_CREATOR_GROUP_SERVER_RID = 3,	/* S-1-3 */

	SECURITY_DIALUP_RID		  = 1,
	SECURITY_NETWORK_RID		  = 2,
	SECURITY_BATCH_RID		  = 3,
	SECURITY_INTERACTIVE_RID	  = 4,
	SECURITY_SERVICE_RID		  = 6,
	SECURITY_ANONYMOUS_LOGON_RID	  = 7,
	SECURITY_PROXY_RID		  = 8,
	SECURITY_ENTERPRISE_CONTROLLERS_RID=9,
	SECURITY_SERVER_LOGON_RID	  = 9,
	SECURITY_PRINCIPAL_SELF_RID	  = 0xa,
	SECURITY_AUTHENTICATED_USER_RID	  = 0xb,
	SECURITY_RESTRICTED_CODE_RID	  = 0xc,
	SECURITY_TERMINAL_SERVER_RID	  = 0xd,

	SECURITY_LOGON_IDS_RID		  = 5,
	SECURITY_LOGON_IDS_RID_COUNT	  = 3,

	SECURITY_LOCAL_SYSTEM_RID	  = 0x12,

	SECURITY_NT_NON_UNIQUE		  = 0x15,

	SECURITY_BUILTIN_DOMAIN_RID	  = 0x20,

	/*
	 * Well-known domain relative sub-authority values (RIDs).
	 */

	/* Users. */
	DOMAIN_USER_RID_ADMIN		  = 0x1f4,
	DOMAIN_USER_RID_GUEST		  = 0x1f5,
	DOMAIN_USER_RID_KRBTGT		  = 0x1f6,

	/* Groups. */
	DOMAIN_GROUP_RID_ADMINS		  = 0x200,
	DOMAIN_GROUP_RID_USERS		  = 0x201,
	DOMAIN_GROUP_RID_GUESTS		  = 0x202,
	DOMAIN_GROUP_RID_COMPUTERS	  = 0x203,
	DOMAIN_GROUP_RID_CONTROLLERS	  = 0x204,
	DOMAIN_GROUP_RID_CERT_ADMINS	  = 0x205,
	DOMAIN_GROUP_RID_SCHEMA_ADMINS	  = 0x206,
	DOMAIN_GROUP_RID_ENTERPRISE_ADMINS= 0x207,
	DOMAIN_GROUP_RID_POLICY_ADMINS	  = 0x208,

	/* Aliases. */
	DOMAIN_ALIAS_RID_ADMINS		  = 0x220,
	DOMAIN_ALIAS_RID_USERS		  = 0x221,
	DOMAIN_ALIAS_RID_GUESTS		  = 0x222,
	DOMAIN_ALIAS_RID_POWER_USERS	  = 0x223,

	DOMAIN_ALIAS_RID_ACCOUNT_OPS	  = 0x224,
	DOMAIN_ALIAS_RID_SYSTEM_OPS	  = 0x225,
	DOMAIN_ALIAS_RID_PRINT_OPS	  = 0x226,
	DOMAIN_ALIAS_RID_BACKUP_OPS	  = 0x227,

	DOMAIN_ALIAS_RID_REPLICATOR	  = 0x228,
	DOMAIN_ALIAS_RID_RAS_SERVERS	  = 0x229,
	DOMAIN_ALIAS_RID_PREW2KCOMPACCESS = 0x22a,
} RELATIVE_IDENTIFIERS;

/*
 * The universal well-known SIDs:
 *
 *	NULL_SID			S-1-0-0
 *	WORLD_SID			S-1-1-0
 *	LOCAL_SID			S-1-2-0
 *	CREATOR_OWNER_SID		S-1-3-0
 *	CREATOR_GROUP_SID		S-1-3-1
 *	CREATOR_OWNER_SERVER_SID	S-1-3-2
 *	CREATOR_GROUP_SERVER_SID	S-1-3-3
 *
 *	(Non-unique IDs)		S-1-4
 *
 * NT well-known SIDs:
 *
 *	NT_AUTHORITY_SID	S-1-5
 *	DIALUP_SID		S-1-5-1
 *
 *	NETWORD_SID		S-1-5-2
 *	BATCH_SID		S-1-5-3
 *	INTERACTIVE_SID		S-1-5-4
 *	SERVICE_SID		S-1-5-6
 *	ANONYMOUS_LOGON_SID	S-1-5-7		(aka null logon session)
 *	PROXY_SID		S-1-5-8
 *	SERVER_LOGON_SID	S-1-5-9		(aka domain controller account)
 *	SELF_SID		S-1-5-10	(self RID)
 *	AUTHENTICATED_USER_SID	S-1-5-11
 *	RESTRICTED_CODE_SID	S-1-5-12	(running restricted code)
 *	TERMINAL_SERVER_SID	S-1-5-13	(running on terminal server)
 *
 *	(Logon IDs)		S-1-5-5-X-Y
 *
 *	(NT non-unique IDs)	S-1-5-0x15-...
 *
 *	(Built-in domain)	S-1-5-0x20
 */

/*
 * The SID_IDENTIFIER_AUTHORITY is a 48-bit value used in the SID structure.
 *
 * NOTE: This is stored as a big endian number, hence the high_part comes
 * before the low_part.
 */
typedef union {
	struct {
		u16 high_part;	/* High 16-bits. */
		u32 low_part;	/* Low 32-bits. */
	} __attribute__ ((__packed__)) parts;
	u8 value[6];		/* Value as individual bytes. */
} __attribute__ ((__packed__)) SID_IDENTIFIER_AUTHORITY;

/*
 * The SID structure is a variable-length structure used to uniquely identify
 * users or groups. SID stands for security identifier.
 *
 * The standard textual representation of the SID is of the form:
 *	S-R-I-S-S...
 * Where:
 *    - The first "S" is the literal character 'S' identifying the following
 *	digits as a SID.
 *    - R is the revision level of the SID expressed as a sequence of digits
 *	either in decimal or hexadecimal (if the later, prefixed by "0x").
 *    - I is the 48-bit identifier_authority, expressed as digits as R above.
 *    - S... is one or more sub_authority values, expressed as digits as above.
 *
 * Example SID; the domain-relative SID of the local Administrators group on
 * Windows NT/2k:
 *	S-1-5-32-544
 * This translates to a SID with:
 *	revision = 1,
 *	sub_authority_count = 2,
 *	identifier_authority = {0,0,0,0,0,5},	// SECURITY_NT_AUTHORITY
 *	sub_authority[0] = 32,			// SECURITY_BUILTIN_DOMAIN_RID
 *	sub_authority[1] = 544			// DOMAIN_ALIAS_RID_ADMINS
 */
typedef struct {
	u8 revision;
	u8 sub_authority_count;
	SID_IDENTIFIER_AUTHORITY identifier_authority;
	le32 sub_authority[1];		/* At least one sub_authority. */
} __attribute__ ((__packed__)) SID;

/*
 * Current constants for SIDs.
 */
typedef enum {
	SID_REVISION			=  1,	/* Current revision level. */
	SID_MAX_SUB_AUTHORITIES		= 15,	/* Maximum number of those. */
	SID_RECOMMENDED_SUB_AUTHORITIES	=  1,	/* Will change to around 6 in
						   a future revision. */
} SID_CONSTANTS;

/*
 * The predefined ACE types (8-bit, see below).
 */
enum {
	ACCESS_MIN_MS_ACE_TYPE		= 0,
	ACCESS_ALLOWED_ACE_TYPE		= 0,
	ACCESS_DENIED_ACE_TYPE		= 1,
	SYSTEM_AUDIT_ACE_TYPE		= 2,
	SYSTEM_ALARM_ACE_TYPE		= 3, /* Not implemented as of Win2k. */
	ACCESS_MAX_MS_V2_ACE_TYPE	= 3,

	ACCESS_ALLOWED_COMPOUND_ACE_TYPE= 4,
	ACCESS_MAX_MS_V3_ACE_TYPE	= 4,

	/* The following are Win2k only. */
	ACCESS_MIN_MS_OBJECT_ACE_TYPE	= 5,
	ACCESS_ALLOWED_OBJECT_ACE_TYPE	= 5,
	ACCESS_DENIED_OBJECT_ACE_TYPE	= 6,
	SYSTEM_AUDIT_OBJECT_ACE_TYPE	= 7,
	SYSTEM_ALARM_OBJECT_ACE_TYPE	= 8,
	ACCESS_MAX_MS_OBJECT_ACE_TYPE	= 8,

	ACCESS_MAX_MS_V4_ACE_TYPE	= 8,

	/* This one is for WinNT/2k. */
	ACCESS_MAX_MS_ACE_TYPE		= 8,
} __attribute__ ((__packed__));

typedef u8 ACE_TYPES;

/*
 * The ACE flags (8-bit) for audit and inheritance (see below).
 *
 * SUCCESSFUL_ACCESS_ACE_FLAG is only used with system audit and alarm ACE
 * types to indicate that a message is generated (in Windows!) for successful
 * accesses.
 *
 * FAILED_ACCESS_ACE_FLAG is only used with system audit and alarm ACE types
 * to indicate that a message is generated (in Windows!) for failed accesses.
 */
enum {
	/* The inheritance flags. */
	OBJECT_INHERIT_ACE		= 0x01,
	CONTAINER_INHERIT_ACE		= 0x02,
	NO_PROPAGATE_INHERIT_ACE	= 0x04,
	INHERIT_ONLY_ACE		= 0x08,
	INHERITED_ACE			= 0x10,	/* Win2k only. */
	VALID_INHERIT_FLAGS		= 0x1f,

	/* The audit flags. */
	SUCCESSFUL_ACCESS_ACE_FLAG	= 0x40,
	FAILED_ACCESS_ACE_FLAG		= 0x80,
} __attribute__ ((__packed__));

typedef u8 ACE_FLAGS;

/*
 * An ACE is an access-control entry in an access-control list (ACL).
 * An ACE defines access to an object for a specific user or group or defines
 * the types of access that generate system-administration messages or alarms
 * for a specific user or group. The user or group is identified by a security
 * identifier (SID).
 *
 * Each ACE starts with an ACE_HEADER structure (aligned on 4-byte boundary),
 * which specifies the type and size of the ACE. The format of the subsequent
 * data depends on the ACE type.
 */
typedef struct {
/*Ofs*/
/*  0*/	ACE_TYPES type;		/* Type of the ACE. */
/*  1*/	ACE_FLAGS flags;	/* Flags describing the ACE. */
/*  2*/	le16 size;		/* Size in bytes of the ACE. */
} __attribute__ ((__packed__)) ACE_HEADER;

/*
 * The access mask (32-bit). Defines the access rights.
 *
 * The specific rights (bits 0 to 15).  These depend on the type of the object
 * being secured by the ACE.
 */
enum {
	/* Specific rights for files and directories are as follows: */

	/* Right to read data from the file. (FILE) */
	FILE_READ_DATA			= const_cpu_to_le32(0x00000001),
	/* Right to list contents of a directory. (DIRECTORY) */
	FILE_LIST_DIRECTORY		= const_cpu_to_le32(0x00000001),

	/* Right to write data to the file. (FILE) */
	FILE_WRITE_DATA			= const_cpu_to_le32(0x00000002),
	/* Right to create a file in the directory. (DIRECTORY) */
	FILE_ADD_FILE			= const_cpu_to_le32(0x00000002),

	/* Right to append data to the file. (FILE) */
	FILE_APPEND_DATA		= const_cpu_to_le32(0x00000004),
	/* Right to create a subdirectory. (DIRECTORY) */
	FILE_ADD_SUBDIRECTORY		= const_cpu_to_le32(0x00000004),

	/* Right to read extended attributes. (FILE/DIRECTORY) */
	FILE_READ_EA			= const_cpu_to_le32(0x00000008),

	/* Right to write extended attributes. (FILE/DIRECTORY) */
	FILE_WRITE_EA			= const_cpu_to_le32(0x00000010),

	/* Right to execute a file. (FILE) */
	FILE_EXECUTE			= const_cpu_to_le32(0x00000020),
	/* Right to traverse the directory. (DIRECTORY) */
	FILE_TRAVERSE			= const_cpu_to_le32(0x00000020),

	/*
	 * Right to delete a directory and all the files it contains (its
	 * children), even if the files are read-only. (DIRECTORY)
	 */
	FILE_DELETE_CHILD		= const_cpu_to_le32(0x00000040),

	/* Right to read file attributes. (FILE/DIRECTORY) */
	FILE_READ_ATTRIBUTES		= const_cpu_to_le32(0x00000080),

	/* Right to change file attributes. (FILE/DIRECTORY) */
	FILE_WRITE_ATTRIBUTES		= const_cpu_to_le32(0x00000100),

	/*
	 * The standard rights (bits 16 to 23).  These are independent of the
	 * type of object being secured.
	 */

	/* Right to delete the object. */
	DELETE				= const_cpu_to_le32(0x00010000),

	/*
	 * Right to read the information in the object's security descriptor,
	 * not including the information in the SACL, i.e. right to read the
	 * security descriptor and owner.
	 */
	READ_CONTROL			= const_cpu_to_le32(0x00020000),

	/* Right to modify the DACL in the object's security descriptor. */
	WRITE_DAC			= const_cpu_to_le32(0x00040000),

	/* Right to change the owner in the object's security descriptor. */
	WRITE_OWNER			= const_cpu_to_le32(0x00080000),

	/*
	 * Right to use the object for synchronization.  Enables a process to
	 * wait until the object is in the signalled state.  Some object types
	 * do not support this access right.
	 */
	SYNCHRONIZE			= const_cpu_to_le32(0x00100000),

	/*
	 * The following STANDARD_RIGHTS_* are combinations of the above for
	 * convenience and are defined by the Win32 API.
	 */

	/* These are currently defined to READ_CONTROL. */
	STANDARD_RIGHTS_READ		= const_cpu_to_le32(0x00020000),
	STANDARD_RIGHTS_WRITE		= const_cpu_to_le32(0x00020000),
	STANDARD_RIGHTS_EXECUTE		= const_cpu_to_le32(0x00020000),

	/* Combines DELETE, READ_CONTROL, WRITE_DAC, and WRITE_OWNER access. */
	STANDARD_RIGHTS_REQUIRED	= const_cpu_to_le32(0x000f0000),

	/*
	 * Combines DELETE, READ_CONTROL, WRITE_DAC, WRITE_OWNER, and
	 * SYNCHRONIZE access.
	 */
	STANDARD_RIGHTS_ALL		= const_cpu_to_le32(0x001f0000),

	/*
	 * The access system ACL and maximum allowed access types (bits 24 to
	 * 25, bits 26 to 27 are reserved).
	 */
	ACCESS_SYSTEM_SECURITY		= const_cpu_to_le32(0x01000000),
	MAXIMUM_ALLOWED			= const_cpu_to_le32(0x02000000),

	/*
	 * The generic rights (bits 28 to 31).  These map onto the standard and
	 * specific rights.
	 */

	/* Read, write, and execute access. */
	GENERIC_ALL			= const_cpu_to_le32(0x10000000),

	/* Execute access. */
	GENERIC_EXECUTE			= const_cpu_to_le32(0x20000000),

	/*
	 * Write access.  For files, this maps onto:
	 *	FILE_APPEND_DATA | FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
	 *	FILE_WRITE_EA | STANDARD_RIGHTS_WRITE | SYNCHRONIZE
	 * For directories, the mapping has the same numerical value.  See
	 * above for the descriptions of the rights granted.
	 */
	GENERIC_WRITE			= const_cpu_to_le32(0x40000000),

	/*
	 * Read access.  For files, this maps onto:
	 *	FILE_READ_ATTRIBUTES | FILE_READ_DATA | FILE_READ_EA |
	 *	STANDARD_RIGHTS_READ | SYNCHRONIZE
	 * For directories, the mapping has the same numberical value.  See
	 * above for the descriptions of the rights granted.
	 */
	GENERIC_READ			= const_cpu_to_le32(0x80000000),
};

typedef le32 ACCESS_MASK;

/*
 * The generic mapping array. Used to denote the mapping of each generic
 * access right to a specific access mask.
 *
 * FIXME: What exactly is this and what is it for? (AIA)
 */
typedef struct {
	ACCESS_MASK generic_read;
	ACCESS_MASK generic_write;
	ACCESS_MASK generic_execute;
	ACCESS_MASK generic_all;
} __attribute__ ((__packed__)) GENERIC_MAPPING;

/*
 * The predefined ACE type structures are as defined below.
 */

/*
 * ACCESS_ALLOWED_ACE, ACCESS_DENIED_ACE, SYSTEM_AUDIT_ACE, SYSTEM_ALARM_ACE
 */
typedef struct {
/*  0	ACE_HEADER; -- Unfolded here as gcc doesn't like unnamed structs. */
	ACE_TYPES type;		/* Type of the ACE. */
	ACE_FLAGS flags;	/* Flags describing the ACE. */
	le16 size;		/* Size in bytes of the ACE. */
/*  4*/	ACCESS_MASK mask;	/* Access mask associated with the ACE. */

/*  8*/	SID sid;		/* The SID associated with the ACE. */
} __attribute__ ((__packed__)) ACCESS_ALLOWED_ACE, ACCESS_DENIED_ACE,
			       SYSTEM_AUDIT_ACE, SYSTEM_ALARM_ACE;

/*
 * The object ACE flags (32-bit).
 */
enum {
	ACE_OBJECT_TYPE_PRESENT			= const_cpu_to_le32(1),
	ACE_INHERITED_OBJECT_TYPE_PRESENT	= const_cpu_to_le32(2),
};

typedef le32 OBJECT_ACE_FLAGS;

typedef struct {
/*  0	ACE_HEADER; -- Unfolded here as gcc doesn't like unnamed structs. */
	ACE_TYPES type;		/* Type of the ACE. */
	ACE_FLAGS flags;	/* Flags describing the ACE. */
	le16 size;		/* Size in bytes of the ACE. */
/*  4*/	ACCESS_MASK mask;	/* Access mask associated with the ACE. */

/*  8*/	OBJECT_ACE_FLAGS object_flags;	/* Flags describing the object ACE. */
/* 12*/	GUID object_type;
/* 28*/	GUID inherited_object_type;

/* 44*/	SID sid;		/* The SID associated with the ACE. */
} __attribute__ ((__packed__)) ACCESS_ALLOWED_OBJECT_ACE,
			       ACCESS_DENIED_OBJECT_ACE,
			       SYSTEM_AUDIT_OBJECT_ACE,
			       SYSTEM_ALARM_OBJECT_ACE;

/*
 * An ACL is an access-control list (ACL).
 * An ACL starts with an ACL header structure, which specifies the size of
 * the ACL and the number of ACEs it contains. The ACL header is followed by
 * zero or more access control entries (ACEs). The ACL as well as each ACE
 * are aligned on 4-byte boundaries.
 */
typedef struct {
	u8 revision;	/* Revision of this ACL. */
	u8 alignment1;
	le16 size;	/* Allocated space in bytes for ACL. Includes this
			   header, the ACEs and the remaining free space. */
	le16 ace_count;	/* Number of ACEs in the ACL. */
	le16 alignment2;
/* sizeof() = 8 bytes */
} __attribute__ ((__packed__)) ACL;

/*
 * Current constants for ACLs.
 */
typedef enum {
	/* Current revision. */
	ACL_REVISION		= 2,
	ACL_REVISION_DS		= 4,

	/* History of revisions. */
	ACL_REVISION1		= 1,
	MIN_ACL_REVISION	= 2,
	ACL_REVISION2		= 2,
	ACL_REVISION3		= 3,
	ACL_REVISION4		= 4,
	MAX_ACL_REVISION	= 4,
} ACL_CONSTANTS;

/*
 * The security descriptor control flags (16-bit).
 *
 * SE_OWNER_DEFAULTED - This boolean flag, when set, indicates that the SID
 *	pointed to by the Owner field was provided by a defaulting mechanism
 *	rather than explicitly provided by the original provider of the
 *	security descriptor.  This may affect the treatment of the SID with
 *	respect to inheritence of an owner.
 *
 * SE_GROUP_DEFAULTED - This boolean flag, when set, indicates that the SID in
 *	the Group field was provided by a defaulting mechanism rather than
 *	explicitly provided by the original provider of the security
 *	descriptor.  This may affect the treatment of the SID with respect to
 *	inheritence of a primary group.
 *
 * SE_DACL_PRESENT - This boolean flag, when set, indicates that the security
 *	descriptor contains a discretionary ACL.  If this flag is set and the
 *	Dacl field of the SECURITY_DESCRIPTOR is null, then a null ACL is
 *	explicitly being specified.
 *
 * SE_DACL_DEFAULTED - This boolean flag, when set, indicates that the ACL
 *	pointed to by the Dacl field was provided by a defaulting mechanism
 *	rather than explicitly provided by the original provider of the
 *	security descriptor.  This may affect the treatment of the ACL with
 *	respect to inheritence of an ACL.  This flag is ignored if the
 *	DaclPresent flag is not set.
 *
 * SE_SACL_PRESENT - This boolean flag, when set,  indicates that the security
 *	descriptor contains a system ACL pointed to by the Sacl field.  If this
 *	flag is set and the Sacl field of the SECURITY_DESCRIPTOR is null, then
 *	an empty (but present) ACL is being specified.
 *
 * SE_SACL_DEFAULTED - This boolean flag, when set, indicates that the ACL
 *	pointed to by the Sacl field was provided by a defaulting mechanism
 *	rather than explicitly provided by the original provider of the
 *	security descriptor.  This may affect the treatment of the ACL with
 *	respect to inheritence of an ACL.  This flag is ignored if the
 *	SaclPresent flag is not set.
 *
 * SE_SELF_RELATIVE - This boolean flag, when set, indicates that the security
 *	descriptor is in self-relative form.  In this form, all fields of the
 *	security descriptor are contiguous in memory and all pointer fields are
 *	expressed as offsets from the beginning of the security descriptor.
 */
enum {
	SE_OWNER_DEFAULTED		= const_cpu_to_le16(0x0001),
	SE_GROUP_DEFAULTED		= const_cpu_to_le16(0x0002),
	SE_DACL_PRESENT			= const_cpu_to_le16(0x0004),
	SE_DACL_DEFAULTED		= const_cpu_to_le16(0x0008),

	SE_SACL_PRESENT			= const_cpu_to_le16(0x0010),
	SE_SACL_DEFAULTED		= const_cpu_to_le16(0x0020),

	SE_DACL_AUTO_INHERIT_REQ	= const_cpu_to_le16(0x0100),
	SE_SACL_AUTO_INHERIT_REQ	= const_cpu_to_le16(0x0200),
	SE_DACL_AUTO_INHERITED		= const_cpu_to_le16(0x0400),
	SE_SACL_AUTO_INHERITED		= const_cpu_to_le16(0x0800),

	SE_DACL_PROTECTED		= const_cpu_to_le16(0x1000),
	SE_SACL_PROTECTED		= const_cpu_to_le16(0x2000),
	SE_RM_CONTROL_VALID		= const_cpu_to_le16(0x4000),
	SE_SELF_RELATIVE		= const_cpu_to_le16(0x8000)
} __attribute__ ((__packed__));

typedef le16 SECURITY_DESCRIPTOR_CONTROL;

/*
 * Self-relative security descriptor. Contains the owner and group SIDs as well
 * as the sacl and dacl ACLs inside the security descriptor itself.
 */
typedef struct {
	u8 revision;	/* Revision level of the security descriptor. */
	u8 alignment;
	SECURITY_DESCRIPTOR_CONTROL control; /* Flags qualifying the type of
			   the descriptor as well as the following fields. */
	le32 owner;	/* Byte offset to a SID representing an object's
			   owner. If this is NULL, no owner SID is present in
			   the descriptor. */
	le32 group;	/* Byte offset to a SID representing an object's
			   primary group. If this is NULL, no primary group
			   SID is present in the descriptor. */
	le32 sacl;	/* Byte offset to a system ACL. Only valid, if
			   SE_SACL_PRESENT is set in the control field. If
			   SE_SACL_PRESENT is set but sacl is NULL, a NULL ACL
			   is specified. */
	le32 dacl;	/* Byte offset to a discretionary ACL. Only valid, if
			   SE_DACL_PRESENT is set in the control field. If
			   SE_DACL_PRESENT is set but dacl is NULL, a NULL ACL
			   (unconditionally granting access) is specified. */
/* sizeof() = 0x14 bytes */
} __attribute__ ((__packed__)) SECURITY_DESCRIPTOR_RELATIVE;

/*
 * Absolute security descriptor. Does not contain the owner and group SIDs, nor
 * the sacl and dacl ACLs inside the security descriptor. Instead, it contains
 * pointers to these structures in memory. Obviously, absolute security
 * descriptors are only useful for in memory representations of security
 * descriptors. On disk, a self-relative security descriptor is used.
 */
typedef struct {
	u8 revision;	/* Revision level of the security descriptor. */
	u8 alignment;
	SECURITY_DESCRIPTOR_CONTROL control;	/* Flags qualifying the type of
			   the descriptor as well as the following fields. */
	SID *owner;	/* Points to a SID representing an object's owner. If
			   this is NULL, no owner SID is present in the
			   descriptor. */
	SID *group;	/* Points to a SID representing an object's primary
			   group. If this is NULL, no primary group SID is
			   present in the descriptor. */
	ACL *sacl;	/* Points to a system ACL. Only valid, if
			   SE_SACL_PRESENT is set in the control field. If
			   SE_SACL_PRESENT is set but sacl is NULL, a NULL ACL
			   is specified. */
	ACL *dacl;	/* Points to a discretionary ACL. Only valid, if
			   SE_DACL_PRESENT is set in the control field. If
			   SE_DACL_PRESENT is set but dacl is NULL, a NULL ACL
			   (unconditionally granting access) is specified. */
} __attribute__ ((__packed__)) SECURITY_DESCRIPTOR;

/*
 * Current constants for security descriptors.
 */
typedef enum {
	/* Current revision. */
	SECURITY_DESCRIPTOR_REVISION	= 1,
	SECURITY_DESCRIPTOR_REVISION1	= 1,

	/* The sizes of both the absolute and relative security descriptors is
	   the same as pointers, at least on ia32 architecture are 32-bit. */
	SECURITY_DESCRIPTOR_MIN_LENGTH	= sizeof(SECURITY_DESCRIPTOR),
} SECURITY_DESCRIPTOR_CONSTANTS;

/*
 * Attribute: Security descriptor (0x50). A standard self-relative security
 * descriptor.
 *
 * NOTE: Can be resident or non-resident.
 * NOTE: Not used in NTFS 3.0+, as security descriptors are stored centrally
 * in FILE_Secure and the correct descriptor is found using the security_id
 * from the standard information attribute.
 */
typedef SECURITY_DESCRIPTOR_RELATIVE SECURITY_DESCRIPTOR_ATTR;

/*
 * On NTFS 3.0+, all security descriptors are stored in FILE_Secure. Only one
 * referenced instance of each unique security descriptor is stored.
 *
 * FILE_Secure contains no unnamed data attribute, i.e. it has zero length. It
 * does, however, contain two indexes ($SDH and $SII) as well as a named data
 * stream ($SDS).
 *
 * Every unique security descriptor is assigned a unique security identifier
 * (security_id, not to be confused with a SID). The security_id is unique for
 * the NTFS volume and is used as an index into the $SII index, which maps
 * security_ids to the security descriptor's storage location within the $SDS
 * data attribute. The $SII index is sorted by ascending security_id.
 *
 * A simple hash is computed from each security descriptor. This hash is used
 * as an index into the $SDH index, which maps security descriptor hashes to
 * the security descriptor's storage location within the $SDS data attribute.
 * The $SDH index is sorted by security descriptor hash and is stored in a B+
 * tree. When searching $SDH (with the intent of determining whether or not a
 * new security descriptor is already present in the $SDS data stream), if a
 * matching hash is found, but the security descriptors do not match, the
 * search in the $SDH index is continued, searching for a next matching hash.
 *
 * When a precise match is found, the security_id coresponding to the security
 * descriptor in the $SDS attribute is read from the found $SDH index entry and
 * is stored in the $STANDARD_INFORMATION attribute of the file/directory to
 * which the security descriptor is being applied. The $STANDARD_INFORMATION
 * attribute is present in all base mft records (i.e. in all files and
 * directories).
 *
 * If a match is not found, the security descriptor is assigned a new unique
 * security_id and is added to the $SDS data attribute. Then, entries
 * referencing the this security descriptor in the $SDS data attribute are
 * added to the $SDH and $SII indexes.
 *
 * Note: Entries are never deleted from FILE_Secure, even if nothing
 * references an entry any more.
 */

/*
 * This header precedes each security descriptor in the $SDS data stream.
 * This is also the index entry data part of both the $SII and $SDH indexes.
 */
typedef struct {
	le32 hash;	  /* Hash of the security descriptor. */
	le32 security_id; /* The security_id assigned to the descriptor. */
	le64 offset;	  /* Byte offset of this entry in the $SDS stream. */
	le32 length;	  /* Size in bytes of this entry in $SDS stream. */
} __attribute__ ((__packed__)) SECURITY_DESCRIPTOR_HEADER;

/*
 * The $SDS data stream contains the security descriptors, aligned on 16-byte
 * boundaries, sorted by security_id in a B+ tree. Security descriptors cannot
 * cross 256kib boundaries (this restriction is imposed by the Windows cache
 * manager). Each security descriptor is contained in a SDS_ENTRY structure.
 * Also, each security descriptor is stored twice in the $SDS stream with a
 * fixed offset of 0x40000 bytes (256kib, the Windows cache manager's max size)
 * between them; i.e. if a SDS_ENTRY specifies an offset of 0x51d0, then the
 * the first copy of the security descriptor will be at offset 0x51d0 in the
 * $SDS data stream and the second copy will be at offset 0x451d0.
 */
typedef struct {
/*Ofs*/
/*  0	SECURITY_DESCRIPTOR_HEADER; -- Unfolded here as gcc doesn't like
				       unnamed structs. */
	le32 hash;	  /* Hash of the security descriptor. */
	le32 security_id; /* The security_id assigned to the descriptor. */
	le64 offset;	  /* Byte offset of this entry in the $SDS stream. */
	le32 length;	  /* Size in bytes of this entry in $SDS stream. */
/* 20*/	SECURITY_DESCRIPTOR_RELATIVE sid; /* The self-relative security
					     descriptor. */
} __attribute__ ((__packed__)) SDS_ENTRY;

/*
 * The index entry key used in the $SII index. The collation type is
 * COLLATION_NTOFS_ULONG.
 */
typedef struct {
	le32 security_id; /* The security_id assigned to the descriptor. */
} __attribute__ ((__packed__)) SII_INDEX_KEY;

/*
 * The index entry key used in the $SDH index. The keys are sorted first by
 * hash and then by security_id. The collation rule is
 * COLLATION_NTOFS_SECURITY_HASH.
 */
typedef struct {
	le32 hash;	  /* Hash of the security descriptor. */
	le32 security_id; /* The security_id assigned to the descriptor. */
} __attribute__ ((__packed__)) SDH_INDEX_KEY;

/*
 * Attribute: Volume name (0x60).
 *
 * NOTE: Always resident.
 * NOTE: Present only in FILE_Volume.
 */
typedef struct {
	ntfschar name[0];	/* The name of the volume in Unicode. */
} __attribute__ ((__packed__)) VOLUME_NAME;

/*
 * Possible flags for the volume (16-bit).
 */
enum {
	VOLUME_IS_DIRTY			= const_cpu_to_le16(0x0001),
	VOLUME_RESIZE_LOG_FILE		= const_cpu_to_le16(0x0002),
	VOLUME_UPGRADE_ON_MOUNT		= const_cpu_to_le16(0x0004),
	VOLUME_MOUNTED_ON_NT4		= const_cpu_to_le16(0x0008),

	VOLUME_DELETE_USN_UNDERWAY	= const_cpu_to_le16(0x0010),
	VOLUME_REPAIR_OBJECT_ID		= const_cpu_to_le16(0x0020),

	VOLUME_MODIFIED_BY_CHKDSK	= const_cpu_to_le16(0x8000),

	VOLUME_FLAGS_MASK		= const_cpu_to_le16(0x803f),

	/* To make our life easier when checking if we must mount read-only. */
	VOLUME_MUST_MOUNT_RO_MASK	= const_cpu_to_le16(0x8027),
} __attribute__ ((__packed__));

typedef le16 VOLUME_FLAGS;

/*
 * Attribute: Volume information (0x70).
 *
 * NOTE: Always resident.
 * NOTE: Present only in FILE_Volume.
 * NOTE: Windows 2000 uses NTFS 3.0 while Windows NT4 service pack 6a uses
 *	 NTFS 1.2. I haven't personally seen other values yet.
 */
typedef struct {
	le64 reserved;		/* Not used (yet?). */
	u8 major_ver;		/* Major version of the ntfs format. */
	u8 minor_ver;		/* Minor version of the ntfs format. */
	VOLUME_FLAGS flags;	/* Bit array of VOLUME_* flags. */
} __attribute__ ((__packed__)) VOLUME_INFORMATION;

/*
 * Attribute: Data attribute (0x80).
 *
 * NOTE: Can be resident or non-resident.
 *
 * Data contents of a file (i.e. the unnamed stream) or of a named stream.
 */
typedef struct {
	u8 data[0];		/* The file's data contents. */
} __attribute__ ((__packed__)) DATA_ATTR;

/*
 * Index header flags (8-bit).
 */
enum {
	/*
	 * When index header is in an index root attribute:
	 */
	SMALL_INDEX = 0, /* The index is small enough to fit inside the index
			    root attribute and there is no index allocation
			    attribute present. */
	LARGE_INDEX = 1, /* The index is too large to fit in the index root
			    attribute and/or an index allocation attribute is
			    present. */
	/*
	 * When index header is in an index block, i.e. is part of index
	 * allocation attribute:
	 */
	LEAF_NODE  = 0, /* This is a leaf node, i.e. there are no more nodes
			   branching off it. */
	INDEX_NODE = 1, /* This node indexes other nodes, i.e. it is not a leaf
			   node. */
	NODE_MASK  = 1, /* Mask for accessing the *_NODE bits. */
} __attribute__ ((__packed__));

typedef u8 INDEX_HEADER_FLAGS;

/*
 * This is the header for indexes, describing the INDEX_ENTRY records, which
 * follow the INDEX_HEADER. Together the index header and the index entries
 * make up a complete index.
 *
 * IMPORTANT NOTE: The offset, length and size structure members are counted
 * relative to the start of the index header structure and not relative to the
 * start of the index root or index allocation structures themselves.
 */
typedef struct {
	le32 entries_offset;		/* Byte offset to first INDEX_ENTRY
					   aligned to 8-byte boundary. */
	le32 index_length;		/* Data size of the index in bytes,
					   i.e. bytes used from allocated
					   size, aligned to 8-byte boundary. */
	le32 allocated_size;		/* Byte size of this index (block),
					   multiple of 8 bytes. */
	/* NOTE: For the index root attribute, the above two numbers are always
	   equal, as the attribute is resident and it is resized as needed. In
	   the case of the index allocation attribute the attribute is not
	   resident and hence the allocated_size is a fixed value and must
	   equal the index_block_size specified by the INDEX_ROOT attribute
	   corresponding to the INDEX_ALLOCATION attribute this INDEX_BLOCK
	   belongs to. */
	INDEX_HEADER_FLAGS flags;	/* Bit field of INDEX_HEADER_FLAGS. */
	u8 reserved[3];			/* Reserved/align to 8-byte boundary. */
} __attribute__ ((__packed__)) INDEX_HEADER;

/*
 * Attribute: Index root (0x90).
 *
 * NOTE: Always resident.
 *
 * This is followed by a sequence of index entries (INDEX_ENTRY structures)
 * as described by the index header.
 *
 * When a directory is small enough to fit inside the index root then this
 * is the only attribute describing the directory. When the directory is too
 * large to fit in the index root, on the other hand, two aditional attributes
 * are present: an index allocation attribute, containing sub-nodes of the B+
 * directory tree (see below), and a bitmap attribute, describing which virtual
 * cluster numbers (vcns) in the index allocation attribute are in use by an
 * index block.
 *
 * NOTE: The root directory (FILE_root) contains an entry for itself. Other
 * dircetories do not contain entries for themselves, though.
 */
typedef struct {
	ATTR_TYPE type;			/* Type of the indexed attribute. Is
					   $FILE_NAME for directories, zero
					   for view indexes. No other values
					   allowed. */
	COLLATION_RULE collation_rule;	/* Collation rule used to sort the
					   index entries. If type is $FILE_NAME,
					   this must be COLLATION_FILE_NAME. */
	le32 index_block_size;		/* Size of each index block in bytes (in
					   the index allocation attribute). */
	u8 clusters_per_index_block;	/* Cluster size of each index block (in
					   the index allocation attribute), when
					   an index block is >= than a cluster,
					   otherwise this will be the log of
					   the size (like how the encoding of
					   the mft record size and the index
					   record size found in the boot sector
					   work). Has to be a power of 2. */
	u8 reserved[3];			/* Reserved/align to 8-byte boundary. */
	INDEX_HEADER index;		/* Index header describing the
					   following index entries. */
} __attribute__ ((__packed__)) INDEX_ROOT;

/*
 * Attribute: Index allocation (0xa0).
 *
 * NOTE: Always non-resident (doesn't make sense to be resident anyway!).
 *
 * This is an array of index blocks. Each index block starts with an
 * INDEX_BLOCK structure containing an index header, followed by a sequence of
 * index entries (INDEX_ENTRY structures), as described by the INDEX_HEADER.
 */
typedef struct {
/*  0	NTFS_RECORD; -- Unfolded here as gcc doesn't like unnamed structs. */
	NTFS_RECORD_TYPE magic;	/* Magic is "INDX". */
	le16 usa_ofs;		/* See NTFS_RECORD definition. */
	le16 usa_count;		/* See NTFS_RECORD definition. */

/*  8*/	sle64 lsn;		/* $LogFile sequence number of the last
				   modification of this index block. */
/* 16*/	leVCN index_block_vcn;	/* Virtual cluster number of the index block.
				   If the cluster_size on the volume is <= the
				   index_block_size of the directory,
				   index_block_vcn counts in units of clusters,
				   and in units of sectors otherwise. */
/* 24*/	INDEX_HEADER index;	/* Describes the following index entries. */
/* sizeof()= 40 (0x28) bytes */
/*
 * When creating the index block, we place the update sequence array at this
 * offset, i.e. before we start with the index entries. This also makes sense,
 * otherwise we could run into problems with the update sequence array
 * containing in itself the last two bytes of a sector which would mean that
 * multi sector transfer protection wouldn't work. As you can't protect data
 * by overwriting it since you then can't get it back...
 * When reading use the data from the ntfs record header.
 */
} __attribute__ ((__packed__)) INDEX_BLOCK;

typedef INDEX_BLOCK INDEX_ALLOCATION;

/*
 * The system file FILE_Extend/$Reparse contains an index named $R listing
 * all reparse points on the volume. The index entry keys are as defined
 * below. Note, that there is no index data associated with the index entries.
 *
 * The index entries are sorted by the index key file_id. The collation rule is
 * COLLATION_NTOFS_ULONGS. FIXME: Verify whether the reparse_tag is not the
 * primary key / is not a key at all. (AIA)
 */
typedef struct {
	le32 reparse_tag;	/* Reparse point type (inc. flags). */
	leMFT_REF file_id;	/* Mft record of the file containing the
				   reparse point attribute. */
} __attribute__ ((__packed__)) REPARSE_INDEX_KEY;

/*
 * Quota flags (32-bit).
 *
 * The user quota flags.  Names explain meaning.
 */
enum {
	QUOTA_FLAG_DEFAULT_LIMITS	= const_cpu_to_le32(0x00000001),
	QUOTA_FLAG_LIMIT_REACHED	= const_cpu_to_le32(0x00000002),
	QUOTA_FLAG_ID_DELETED		= const_cpu_to_le32(0x00000004),

	QUOTA_FLAG_USER_MASK		= const_cpu_to_le32(0x00000007),
	/* This is a bit mask for the user quota flags. */

	/*
	 * These flags are only present in the quota defaults index entry, i.e.
	 * in the entry where owner_id = QUOTA_DEFAULTS_ID.
	 */
	QUOTA_FLAG_TRACKING_ENABLED	= const_cpu_to_le32(0x00000010),
	QUOTA_FLAG_ENFORCEMENT_ENABLED	= const_cpu_to_le32(0x00000020),
	QUOTA_FLAG_TRACKING_REQUESTED	= const_cpu_to_le32(0x00000040),
	QUOTA_FLAG_LOG_THRESHOLD	= const_cpu_to_le32(0x00000080),

	QUOTA_FLAG_LOG_LIMIT		= const_cpu_to_le32(0x00000100),
	QUOTA_FLAG_OUT_OF_DATE		= const_cpu_to_le32(0x00000200),
	QUOTA_FLAG_CORRUPT		= const_cpu_to_le32(0x00000400),
	QUOTA_FLAG_PENDING_DELETES	= const_cpu_to_le32(0x00000800),
};

typedef le32 QUOTA_FLAGS;

/*
 * The system file FILE_Extend/$Quota contains two indexes $O and $Q. Quotas
 * are on a per volume and per user basis.
 *
 * The $Q index contains one entry for each existing user_id on the volume. The
 * index key is the user_id of the user/group owning this quota control entry,
 * i.e. the key is the owner_id. The user_id of the owner of a file, i.e. the
 * owner_id, is found in the standard information attribute. The collation rule
 * for $Q is COLLATION_NTOFS_ULONG.
 *
 * The $O index contains one entry for each user/group who has been assigned
 * a quota on that volume. The index key holds the SID of the user_id the
 * entry belongs to, i.e. the owner_id. The collation rule for $O is
 * COLLATION_NTOFS_SID.
 *
 * The $O index entry data is the user_id of the user corresponding to the SID.
 * This user_id is used as an index into $Q to find the quota control entry
 * associated with the SID.
 *
 * The $Q index entry data is the quota control entry and is defined below.
 */
typedef struct {
	le32 version;		/* Currently equals 2. */
	QUOTA_FLAGS flags;	/* Flags describing this quota entry. */
	le64 bytes_used;	/* How many bytes of the quota are in use. */
	sle64 change_time;	/* Last time this quota entry was changed. */
	sle64 threshold;	/* Soft quota (-1 if not limited). */
	sle64 limit;		/* Hard quota (-1 if not limited). */
	sle64 exceeded_time;	/* How long the soft quota has been exceeded. */
	SID sid;		/* The SID of the user/object associated with
				   this quota entry.  Equals zero for the quota
				   defaults entry (and in fact on a WinXP
				   volume, it is not present at all). */
} __attribute__ ((__packed__)) QUOTA_CONTROL_ENTRY;

/*
 * Predefined owner_id values (32-bit).
 */
enum {
	QUOTA_INVALID_ID	= const_cpu_to_le32(0x00000000),
	QUOTA_DEFAULTS_ID	= const_cpu_to_le32(0x00000001),
	QUOTA_FIRST_USER_ID	= const_cpu_to_le32(0x00000100),
};

/*
 * Current constants for quota control entries.
 */
typedef enum {
	/* Current version. */
	QUOTA_VERSION	= 2,
} QUOTA_CONTROL_ENTRY_CONSTANTS;

/*
 * Index entry flags (16-bit).
 */
enum {
	INDEX_ENTRY_NODE = const_cpu_to_le16(1), /* This entry contains a
			sub-node, i.e. a reference to an index block in form of
			a virtual cluster number (see below). */
	INDEX_ENTRY_END  = const_cpu_to_le16(2), /* This signifies the last
			entry in an index block.  The index entry does not
			represent a file but it can point to a sub-node. */

	INDEX_ENTRY_SPACE_FILLER = const_cpu_to_le16(0xffff), /* gcc: Force
			enum bit width to 16-bit. */
} __attribute__ ((__packed__));

typedef le16 INDEX_ENTRY_FLAGS;

/*
 * This the index entry header (see below).
 */
typedef struct {
/*  0*/	union {
		struct { /* Only valid when INDEX_ENTRY_END is not set. */
			leMFT_REF indexed_file;	/* The mft reference of the file
						   described by this index
						   entry. Used for directory
						   indexes. */
		} __attribute__ ((__packed__)) dir;
		struct { /* Used for views/indexes to find the entry's data. */
			le16 data_offset;	/* Data byte offset from this
						   INDEX_ENTRY. Follows the
						   index key. */
			le16 data_length;	/* Data length in bytes. */
			le32 reservedV;		/* Reserved (zero). */
		} __attribute__ ((__packed__)) vi;
	} __attribute__ ((__packed__)) data;
/*  8*/	le16 length;		 /* Byte size of this index entry, multiple of
				    8-bytes. */
/* 10*/	le16 key_length;	 /* Byte size of the key value, which is in the
				    index entry. It follows field reserved. Not
				    multiple of 8-bytes. */
/* 12*/	INDEX_ENTRY_FLAGS flags; /* Bit field of INDEX_ENTRY_* flags. */
/* 14*/	le16 reserved;		 /* Reserved/align to 8-byte boundary. */
/* sizeof() = 16 bytes */
} __attribute__ ((__packed__)) INDEX_ENTRY_HEADER;

/*
 * This is an index entry. A sequence of such entries follows each INDEX_HEADER
 * structure. Together they make up a complete index. The index follows either
 * an index root attribute or an index allocation attribute.
 *
 * NOTE: Before NTFS 3.0 only filename attributes were indexed.
 */
typedef struct {
/*Ofs*/
/*  0	INDEX_ENTRY_HEADER; -- Unfolded here as gcc dislikes unnamed structs. */
	union {
		struct { /* Only valid when INDEX_ENTRY_END is not set. */
			leMFT_REF indexed_file;	/* The mft reference of the file
						   described by this index
						   entry. Used for directory
						   indexes. */
		} __attribute__ ((__packed__)) dir;
		struct { /* Used for views/indexes to find the entry's data. */
			le16 data_offset;	/* Data byte offset from this
						   INDEX_ENTRY. Follows the
						   index key. */
			le16 data_length;	/* Data length in bytes. */
			le32 reservedV;		/* Reserved (zero). */
		} __attribute__ ((__packed__)) vi;
	} __attribute__ ((__packed__)) data;
	le16 length;		 /* Byte size of this index entry, multiple of
				    8-bytes. */
	le16 key_length;	 /* Byte size of the key value, which is in the
				    index entry. It follows field reserved. Not
				    multiple of 8-bytes. */
	INDEX_ENTRY_FLAGS flags; /* Bit field of INDEX_ENTRY_* flags. */
	le16 reserved;		 /* Reserved/align to 8-byte boundary. */

/* 16*/	union {		/* The key of the indexed attribute. NOTE: Only present
			   if INDEX_ENTRY_END bit in flags is not set. NOTE: On
			   NTFS versions before 3.0 the only valid key is the
			   FILE_NAME_ATTR. On NTFS 3.0+ the following
			   additional index keys are defined: */
		FILE_NAME_ATTR file_name;/* $I30 index in directories. */
		SII_INDEX_KEY sii;	/* $SII index in $Secure. */
		SDH_INDEX_KEY sdh;	/* $SDH index in $Secure. */
		GUID object_id;		/* $O index in FILE_Extend/$ObjId: The
					   object_id of the mft record found in
					   the data part of the index. */
		REPARSE_INDEX_KEY reparse;	/* $R index in
						   FILE_Extend/$Reparse. */
		SID sid;		/* $O index in FILE_Extend/$Quota:
					   SID of the owner of the user_id. */
		le32 owner_id;		/* $Q index in FILE_Extend/$Quota:
					   user_id of the owner of the quota
					   control entry in the data part of
					   the index. */
	} __attribute__ ((__packed__)) key;
	/* The (optional) index data is inserted here when creating. */
	// leVCN vcn;	/* If INDEX_ENTRY_NODE bit in flags is set, the last
	//		   eight bytes of this index entry contain the virtual
	//		   cluster number of the index block that holds the
	//		   entries immediately preceding the current entry (the
	//		   vcn references the corresponding cluster in the data
	//		   of the non-resident index allocation attribute). If
	//		   the key_length is zero, then the vcn immediately
	//		   follows the INDEX_ENTRY_HEADER. Regardless of
	//		   key_length, the address of the 8-byte boundary
	//		   alligned vcn of INDEX_ENTRY{_HEADER} *ie is given by
	//		   (char*)ie + le16_to_cpu(ie*)->length) - sizeof(VCN),
	//		   where sizeof(VCN) can be hardcoded as 8 if wanted. */
} __attribute__ ((__packed__)) INDEX_ENTRY;

/*
 * Attribute: Bitmap (0xb0).
 *
 * Contains an array of bits (aka a bitfield).
 *
 * When used in conjunction with the index allocation attribute, each bit
 * corresponds to one index block within the index allocation attribute. Thus
 * the number of bits in the bitmap * index block size / cluster size is the
 * number of clusters in the index allocation attribute.
 */
typedef struct {
	u8 bitmap[0];			/* Array of bits. */
} __attribute__ ((__packed__)) BITMAP_ATTR;

/*
 * The reparse point tag defines the type of the reparse point. It also
 * includes several flags, which further describe the reparse point.
 *
 * The reparse point tag is an unsigned 32-bit value divided in three parts:
 *
 * 1. The least significant 16 bits (i.e. bits 0 to 15) specifiy the type of
 *    the reparse point.
 * 2. The 13 bits after this (i.e. bits 16 to 28) are reserved for future use.
 * 3. The most significant three bits are flags describing the reparse point.
 *    They are defined as follows:
 *	bit 29: Name surrogate bit. If set, the filename is an alias for
 *		another object in the system.
 *	bit 30: High-latency bit. If set, accessing the first byte of data will
 *		be slow. (E.g. the data is stored on a tape drive.)
 *	bit 31: Microsoft bit. If set, the tag is owned by Microsoft. User
 *		defined tags have to use zero here.
 *
 * These are the predefined reparse point tags:
 */
enum {
	IO_REPARSE_TAG_IS_ALIAS		= const_cpu_to_le32(0x20000000),
	IO_REPARSE_TAG_IS_HIGH_LATENCY	= const_cpu_to_le32(0x40000000),
	IO_REPARSE_TAG_IS_MICROSOFT	= const_cpu_to_le32(0x80000000),

	IO_REPARSE_TAG_RESERVED_ZERO	= const_cpu_to_le32(0x00000000),
	IO_REPARSE_TAG_RESERVED_ONE	= const_cpu_to_le32(0x00000001),
	IO_REPARSE_TAG_RESERVED_RANGE	= const_cpu_to_le32(0x00000001),

	IO_REPARSE_TAG_NSS		= const_cpu_to_le32(0x68000005),
	IO_REPARSE_TAG_NSS_RECOVER	= const_cpu_to_le32(0x68000006),
	IO_REPARSE_TAG_SIS		= const_cpu_to_le32(0x68000007),
	IO_REPARSE_TAG_DFS		= const_cpu_to_le32(0x68000008),

	IO_REPARSE_TAG_MOUNT_POINT	= const_cpu_to_le32(0x88000003),

	IO_REPARSE_TAG_HSM		= const_cpu_to_le32(0xa8000004),

	IO_REPARSE_TAG_SYMBOLIC_LINK	= const_cpu_to_le32(0xe8000000),

	IO_REPARSE_TAG_VALID_VALUES	= const_cpu_to_le32(0xe000ffff),
};

/*
 * Attribute: Reparse point (0xc0).
 *
 * NOTE: Can be resident or non-resident.
 */
typedef struct {
	le32 reparse_tag;		/* Reparse point type (inc. flags). */
	le16 reparse_data_length;	/* Byte size of reparse data. */
	le16 reserved;			/* Align to 8-byte boundary. */
	u8 reparse_data[0];		/* Meaning depends on reparse_tag. */
} __attribute__ ((__packed__)) REPARSE_POINT;

/*
 * Attribute: Extended attribute (EA) information (0xd0).
 *
 * NOTE: Always resident. (Is this true???)
 */
typedef struct {
	le16 ea_length;		/* Byte size of the packed extended
				   attributes. */
	le16 need_ea_count;	/* The number of extended attributes which have
				   the NEED_EA bit set. */
	le32 ea_query_length;	/* Byte size of the buffer required to query
				   the extended attributes when calling
				   ZwQueryEaFile() in Windows NT/2k. I.e. the
				   byte size of the unpacked extended
				   attributes. */
} __attribute__ ((__packed__)) EA_INFORMATION;

/*
 * Extended attribute flags (8-bit).
 */
enum {
	NEED_EA	= 0x80
} __attribute__ ((__packed__));

typedef u8 EA_FLAGS;

/*
 * Attribute: Extended attribute (EA) (0xe0).
 *
 * NOTE: Always non-resident. (Is this true?)
 *
 * Like the attribute list and the index buffer list, the EA attribute value is
 * a sequence of EA_ATTR variable length records.
 *
 * FIXME: It appears weird that the EA name is not unicode. Is it true?
 */
typedef struct {
	le32 next_entry_offset;	/* Offset to the next EA_ATTR. */
	EA_FLAGS flags;		/* Flags describing the EA. */
	u8 ea_name_length;	/* Length of the name of the EA in bytes. */
	le16 ea_value_length;	/* Byte size of the EA's value. */
	u8 ea_name[0];		/* Name of the EA. */
	u8 ea_value[0];		/* The value of the EA. Immediately follows
				   the name. */
} __attribute__ ((__packed__)) EA_ATTR;

/*
 * Attribute: Property set (0xf0).
 *
 * Intended to support Native Structure Storage (NSS) - a feature removed from
 * NTFS 3.0 during beta testing.
 */
typedef struct {
	/* Irrelevant as feature unused. */
} __attribute__ ((__packed__)) PROPERTY_SET;

/*
 * Attribute: Logged utility stream (0x100).
 *
 * NOTE: Can be resident or non-resident.
 *
 * Operations on this attribute are logged to the journal ($LogFile) like
 * normal metadata changes.
 *
 * Used by the Encrypting File System (EFS). All encrypted files have this
 * attribute with the name $EFS.
 */
typedef struct {
	/* Can be anything the creator chooses. */
	/* EFS uses it as follows: */
	// FIXME: Type this info, verifying it along the way. (AIA)
} __attribute__ ((__packed__)) LOGGED_UTILITY_STREAM, EFS_ATTR;

#endif /* _LINUX_NTFS_LAYOUT_H */