aboutsummaryrefslogtreecommitdiffstats
path: root/fs/ocfs2/ocfs2_fs.h
blob: bf2e7764920e92e3d621a94caac7124b3fa15914 (plain) (blame)
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
/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * ocfs2_fs.h
 *
 * On-disk structures for OCFS2.
 *
 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License, version 2,  as published by the Free Software Foundation.
 *
 * This program 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; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef _OCFS2_FS_H
#define _OCFS2_FS_H

/* Version */
#define OCFS2_MAJOR_REV_LEVEL		0
#define OCFS2_MINOR_REV_LEVEL          	90

/*
 * An OCFS2 volume starts this way:
 * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS.
 * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS.
 * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock.
 *
 * All other structures are found from the superblock information.
 *
 * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors.  eg, for a
 * blocksize of 2K, it is 4096 bytes into disk.
 */
#define OCFS2_SUPER_BLOCK_BLKNO		2

/*
 * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
 * grow if needed.
 */
#define OCFS2_MIN_CLUSTERSIZE		4096
#define OCFS2_MAX_CLUSTERSIZE		1048576

/*
 * Blocks cannot be bigger than clusters, so the maximum blocksize is the
 * minimum cluster size.
 */
#define OCFS2_MIN_BLOCKSIZE		512
#define OCFS2_MAX_BLOCKSIZE		OCFS2_MIN_CLUSTERSIZE

/* Filesystem magic number */
#define OCFS2_SUPER_MAGIC		0x7461636f

/* Object signatures */
#define OCFS2_SUPER_BLOCK_SIGNATURE	"OCFSV2"
#define OCFS2_INODE_SIGNATURE		"INODE01"
#define OCFS2_EXTENT_BLOCK_SIGNATURE	"EXBLK01"
#define OCFS2_GROUP_DESC_SIGNATURE      "GROUP01"
#define OCFS2_XATTR_BLOCK_SIGNATURE	"XATTR01"
#define OCFS2_DIR_TRAILER_SIGNATURE	"DIRTRL1"
#define OCFS2_DX_ROOT_SIGNATURE		"DXDIR01"
#define OCFS2_DX_LEAF_SIGNATURE		"DXLEAF1"
#define OCFS2_REFCOUNT_BLOCK_SIGNATURE	"REFCNT1"

/* Compatibility flags */
#define OCFS2_HAS_COMPAT_FEATURE(sb,mask)			\
	( OCFS2_SB(sb)->s_feature_compat & (mask) )
#define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask)			\
	( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
#define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask)			\
	( OCFS2_SB(sb)->s_feature_incompat & (mask) )
#define OCFS2_SET_COMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_compat |= (mask)
#define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_ro_compat |= (mask)
#define OCFS2_SET_INCOMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_incompat |= (mask)
#define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_compat &= ~(mask)
#define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
#define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask)			\
	OCFS2_SB(sb)->s_feature_incompat &= ~(mask)

#define OCFS2_FEATURE_COMPAT_SUPP	(OCFS2_FEATURE_COMPAT_BACKUP_SB	\
					 | OCFS2_FEATURE_COMPAT_JBD2_SB)
#define OCFS2_FEATURE_INCOMPAT_SUPP	(OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
					 | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
					 | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \
					 | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
					 | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
					 | OCFS2_FEATURE_INCOMPAT_XATTR \
					 | OCFS2_FEATURE_INCOMPAT_META_ECC \
					 | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \
					 | OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE \
					 | OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG	\
					 | OCFS2_FEATURE_INCOMPAT_CLUSTERINFO)
#define OCFS2_FEATURE_RO_COMPAT_SUPP	(OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
					 | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
					 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)

/*
 * Heartbeat-only devices are missing journals and other files.  The
 * filesystem driver can't load them, but the library can.  Never put
 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
 */
#define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV	0x0002

/*
 * tunefs sets this incompat flag before starting the resize and clears it
 * at the end. This flag protects users from inadvertently mounting the fs
 * after an aborted run without fsck-ing.
 */
#define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG    0x0004

/* Used to denote a non-clustered volume */
#define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT	0x0008

/* Support for sparse allocation in b-trees */
#define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC	0x0010

/*
 * Tunefs sets this incompat flag before starting an operation which
 * would require cleanup on abort. This is done to protect users from
 * inadvertently mounting the fs after an aborted run without
 * fsck-ing.
 *
 * s_tunefs_flags on the super block describes precisely which
 * operations were in progress.
 */
#define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG	0x0020

/* Support for data packed into inode blocks */
#define OCFS2_FEATURE_INCOMPAT_INLINE_DATA	0x0040

/*
 * Support for alternate, userspace cluster stacks.  If set, the superblock
 * field s_cluster_info contains a tag for the alternate stack in use as
 * well as the name of the cluster being joined.
 * mount.ocfs2 must pass in a matching stack name.
 *
 * If not set, the classic stack will be used.  This is compatbile with
 * all older versions.
 */
#define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK	0x0080

/* Support for the extended slot map */
#define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100

/* Support for extended attributes */
#define OCFS2_FEATURE_INCOMPAT_XATTR		0x0200

/* Support for indexed directores */
#define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS	0x0400

/* Metadata checksum and error correction */
#define OCFS2_FEATURE_INCOMPAT_META_ECC		0x0800

/* Refcount tree support */
#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE	0x1000

/* Discontigous block groups */
#define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG	0x2000

/*
 * Incompat bit to indicate useable clusterinfo with stackflags for all
 * cluster stacks (userspace adnd o2cb). If this bit is set,
 * INCOMPAT_USERSPACE_STACK becomes superfluous and thus should not be set.
 */
#define OCFS2_FEATURE_INCOMPAT_CLUSTERINFO	0x4000

/*
 * backup superblock flag is used to indicate that this volume
 * has backup superblocks.
 */
#define OCFS2_FEATURE_COMPAT_BACKUP_SB		0x0001

/*
 * The filesystem will correctly handle journal feature bits.
 */
#define OCFS2_FEATURE_COMPAT_JBD2_SB		0x0002

/*
 * Unwritten extents support.
 */
#define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN	0x0001

/*
 * Maintain quota information for this filesystem
 */
#define OCFS2_FEATURE_RO_COMPAT_USRQUOTA	0x0002
#define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA	0x0004

/* The byte offset of the first backup block will be 1G.
 * The following will be 4G, 16G, 64G, 256G and 1T.
 */
#define OCFS2_BACKUP_SB_START			1 << 30

/* the max backup superblock nums */
#define OCFS2_MAX_BACKUP_SUPERBLOCKS	6

/*
 * Flags on ocfs2_super_block.s_tunefs_flags
 */
#define OCFS2_TUNEFS_INPROG_REMOVE_SLOT		0x0001	/* Removing slots */

/*
 * Flags on ocfs2_dinode.i_flags
 */
#define OCFS2_VALID_FL		(0x00000001)	/* Inode is valid */
#define OCFS2_UNUSED2_FL	(0x00000002)
#define OCFS2_ORPHANED_FL	(0x00000004)	/* On the orphan list */
#define OCFS2_UNUSED3_FL	(0x00000008)
/* System inode flags */
#define OCFS2_SYSTEM_FL		(0x00000010)	/* System inode */
#define OCFS2_SUPER_BLOCK_FL	(0x00000020)	/* Super block */
#define OCFS2_LOCAL_ALLOC_FL	(0x00000040)	/* Slot local alloc bitmap */
#define OCFS2_BITMAP_FL		(0x00000080)	/* Allocation bitmap */
#define OCFS2_JOURNAL_FL	(0x00000100)	/* Slot local journal */
#define OCFS2_HEARTBEAT_FL	(0x00000200)	/* Heartbeat area */
#define OCFS2_CHAIN_FL		(0x00000400)	/* Chain allocator */
#define OCFS2_DEALLOC_FL	(0x00000800)	/* Truncate log */
#define OCFS2_QUOTA_FL		(0x00001000)	/* Quota file */

/*
 * Flags on ocfs2_dinode.i_dyn_features
 *
 * These can change much more often than i_flags. When adding flags,
 * keep in mind that i_dyn_features is only 16 bits wide.
 */
#define OCFS2_INLINE_DATA_FL	(0x0001)	/* Data stored in inode block */
#define OCFS2_HAS_XATTR_FL	(0x0002)
#define OCFS2_INLINE_XATTR_FL	(0x0004)
#define OCFS2_INDEXED_DIR_FL	(0x0008)
#define OCFS2_HAS_REFCOUNT_FL   (0x0010)

/* Inode attributes, keep in sync with EXT2 */
#define OCFS2_SECRM_FL			FS_SECRM_FL	/* Secure deletion */
#define OCFS2_UNRM_FL			FS_UNRM_FL	/* Undelete */
#define OCFS2_COMPR_FL			FS_COMPR_FL	/* Compress file */
#define OCFS2_SYNC_FL			FS_SYNC_FL	/* Synchronous updates */
#define OCFS2_IMMUTABLE_FL		FS_IMMUTABLE_FL	/* Immutable file */
#define OCFS2_APPEND_FL			FS_APPEND_FL	/* writes to file may only append */
#define OCFS2_NODUMP_FL			FS_NODUMP_FL	/* do not dump file */
#define OCFS2_NOATIME_FL		FS_NOATIME_FL	/* do not update atime */
/* Reserved for compression usage... */
#define OCFS2_DIRTY_FL			FS_DIRTY_FL
#define OCFS2_COMPRBLK_FL		FS_COMPRBLK_FL	/* One or more compressed clusters */
#define OCFS2_NOCOMP_FL			FS_NOCOMP_FL	/* Don't compress */
#define OCFS2_ECOMPR_FL			FS_ECOMPR_FL	/* Compression error */
/* End compression flags --- maybe not all used */
#define OCFS2_BTREE_FL			FS_BTREE_FL	/* btree format dir */
#define OCFS2_INDEX_FL			FS_INDEX_FL	/* hash-indexed directory */
#define OCFS2_IMAGIC_FL			FS_IMAGIC_FL	/* AFS directory */
#define OCFS2_JOURNAL_DATA_FL		FS_JOURNAL_DATA_FL /* Reserved for ext3 */
#define OCFS2_NOTAIL_FL			FS_NOTAIL_FL	/* file tail should not be merged */
#define OCFS2_DIRSYNC_FL		FS_DIRSYNC_FL	/* dirsync behaviour (directories only) */
#define OCFS2_TOPDIR_FL			FS_TOPDIR_FL	/* Top of directory hierarchies*/
#define OCFS2_RESERVED_FL		FS_RESERVED_FL	/* reserved for ext2 lib */

#define OCFS2_FL_VISIBLE		FS_FL_USER_VISIBLE	/* User visible flags */
#define OCFS2_FL_MODIFIABLE		FS_FL_USER_MODIFIABLE	/* User modifiable flags */

/*
 * Extent record flags (e_node.leaf.flags)
 */
#define OCFS2_EXT_UNWRITTEN		(0x01)	/* Extent is allocated but
						 * unwritten */
#define OCFS2_EXT_REFCOUNTED		(0x02)  /* Extent is reference
						 * counted in an associated
						 * refcount tree */

/*
 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
 */
#define OCFS2_JOURNAL_DIRTY_FL	(0x00000001)	/* Journal needs recovery */

/*
 * superblock s_state flags
 */
#define OCFS2_ERROR_FS		(0x00000001)	/* FS saw errors */

/* Limit of space in ocfs2_dir_entry */
#define OCFS2_MAX_FILENAME_LEN		255

/* Maximum slots on an ocfs2 file system */
#define OCFS2_MAX_SLOTS			255

/* Slot map indicator for an empty slot */
#define OCFS2_INVALID_SLOT		-1

#define OCFS2_VOL_UUID_LEN		16
#define OCFS2_MAX_VOL_LABEL_LEN		64

/* The cluster stack fields */
#define OCFS2_STACK_LABEL_LEN		4
#define OCFS2_CLUSTER_NAME_LEN		16

/* Classic (historically speaking) cluster stack */
#define OCFS2_CLASSIC_CLUSTER_STACK	"o2cb"

/* Journal limits (in bytes) */
#define OCFS2_MIN_JOURNAL_SIZE		(4 * 1024 * 1024)

/*
 * Inline extended attribute size (in bytes)
 * The value chosen should be aligned to 16 byte boundaries.
 */
#define OCFS2_MIN_XATTR_INLINE_SIZE     256

/*
 * Cluster info flags (ocfs2_cluster_info.ci_stackflags)
 */
#define OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT	(0x01)

struct ocfs2_system_inode_info {
	char	*si_name;
	int	si_iflags;
	int	si_mode;
};

/* System file index */
enum {
	BAD_BLOCK_SYSTEM_INODE = 0,
	GLOBAL_INODE_ALLOC_SYSTEM_INODE,
	SLOT_MAP_SYSTEM_INODE,
#define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
	HEARTBEAT_SYSTEM_INODE,
	GLOBAL_BITMAP_SYSTEM_INODE,
	USER_QUOTA_SYSTEM_INODE,
	GROUP_QUOTA_SYSTEM_INODE,
#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE
#define OCFS2_FIRST_LOCAL_SYSTEM_INODE ORPHAN_DIR_SYSTEM_INODE
	ORPHAN_DIR_SYSTEM_INODE,
	EXTENT_ALLOC_SYSTEM_INODE,
	INODE_ALLOC_SYSTEM_INODE,
	JOURNAL_SYSTEM_INODE,
	LOCAL_ALLOC_SYSTEM_INODE,
	TRUNCATE_LOG_SYSTEM_INODE,
	LOCAL_USER_QUOTA_SYSTEM_INODE,
	LOCAL_GROUP_QUOTA_SYSTEM_INODE,
#define OCFS2_LAST_LOCAL_SYSTEM_INODE LOCAL_GROUP_QUOTA_SYSTEM_INODE
	NUM_SYSTEM_INODES
};
#define NUM_GLOBAL_SYSTEM_INODES OCFS2_FIRST_LOCAL_SYSTEM_INODE
#define NUM_LOCAL_SYSTEM_INODES	\
		(NUM_SYSTEM_INODES - OCFS2_FIRST_LOCAL_SYSTEM_INODE)

static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
	/* Global system inodes (single copy) */
	/* The first two are only used from userspace mfks/tunefs */
	[BAD_BLOCK_SYSTEM_INODE]		= { "bad_blocks", 0, S_IFREG | 0644 },
	[GLOBAL_INODE_ALLOC_SYSTEM_INODE] 	= { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },

	/* These are used by the running filesystem */
	[SLOT_MAP_SYSTEM_INODE]			= { "slot_map", 0, S_IFREG | 0644 },
	[HEARTBEAT_SYSTEM_INODE]		= { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
	[GLOBAL_BITMAP_SYSTEM_INODE]		= { "global_bitmap", 0, S_IFREG | 0644 },
	[USER_QUOTA_SYSTEM_INODE]		= { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 },
	[GROUP_QUOTA_SYSTEM_INODE]		= { "aquota.group", OCFS2_QUOTA_FL, S_IFREG | 0644 },

	/* Slot-specific system inodes (one copy per slot) */
	[ORPHAN_DIR_SYSTEM_INODE]		= { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
	[EXTENT_ALLOC_SYSTEM_INODE]		= { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
	[INODE_ALLOC_SYSTEM_INODE]		= { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
	[JOURNAL_SYSTEM_INODE]			= { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
	[LOCAL_ALLOC_SYSTEM_INODE]		= { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
	[TRUNCATE_LOG_SYSTEM_INODE]		= { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 },
	[LOCAL_USER_QUOTA_SYSTEM_INODE]		= { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
	[LOCAL_GROUP_QUOTA_SYSTEM_INODE]	= { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
};

/* Parameter passed from mount.ocfs2 to module */
#define OCFS2_HB_NONE			"heartbeat=none"
#define OCFS2_HB_LOCAL			"heartbeat=local"
#define OCFS2_HB_GLOBAL			"heartbeat=global"

/*
 * OCFS2 directory file types.  Only the low 3 bits are used.  The
 * other bits are reserved for now.
 */
#define OCFS2_FT_UNKNOWN	0
#define OCFS2_FT_REG_FILE	1
#define OCFS2_FT_DIR		2
#define OCFS2_FT_CHRDEV		3
#define OCFS2_FT_BLKDEV		4
#define OCFS2_FT_FIFO		5
#define OCFS2_FT_SOCK		6
#define OCFS2_FT_SYMLINK	7

#define OCFS2_FT_MAX		8

/*
 * OCFS2_DIR_PAD defines the directory entries boundaries
 *
 * NOTE: It must be a multiple of 4
 */
#define OCFS2_DIR_PAD			4
#define OCFS2_DIR_ROUND			(OCFS2_DIR_PAD - 1)
#define OCFS2_DIR_MEMBER_LEN 		offsetof(struct ocfs2_dir_entry, name)
#define OCFS2_DIR_REC_LEN(name_len)	(((name_len) + OCFS2_DIR_MEMBER_LEN + \
                                          OCFS2_DIR_ROUND) & \
					 ~OCFS2_DIR_ROUND)
#define OCFS2_DIR_MIN_REC_LEN	OCFS2_DIR_REC_LEN(1)

#define OCFS2_LINK_MAX		32000
#define	OCFS2_DX_LINK_MAX	((1U << 31) - 1U)
#define	OCFS2_LINKS_HI_SHIFT	16
#define	OCFS2_DX_ENTRIES_MAX	(0xffffffffU)

#define S_SHIFT			12
static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
	[S_IFREG >> S_SHIFT]  = OCFS2_FT_REG_FILE,
	[S_IFDIR >> S_SHIFT]  = OCFS2_FT_DIR,
	[S_IFCHR >> S_SHIFT]  = OCFS2_FT_CHRDEV,
	[S_IFBLK >> S_SHIFT]  = OCFS2_FT_BLKDEV,
	[S_IFIFO >> S_SHIFT]  = OCFS2_FT_FIFO,
	[S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
	[S_IFLNK >> S_SHIFT]  = OCFS2_FT_SYMLINK,
};


/*
 * Convenience casts
 */
#define OCFS2_RAW_SB(dinode)		(&((dinode)->id2.i_super))

/*
 * Block checking structure.  This is used in metadata to validate the
 * contents.  If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all
 * zeros.
 */
struct ocfs2_block_check {
/*00*/	__le32 bc_crc32e;	/* 802.3 Ethernet II CRC32 */
	__le16 bc_ecc;		/* Single-error-correction parity vector.
				   This is a simple Hamming code dependant
				   on the blocksize.  OCFS2's maximum
				   blocksize, 4K, requires 16 parity bits,
				   so we fit in __le16. */
	__le16 bc_reserved1;
/*08*/
};

/*
 * On disk extent record for OCFS2
 * It describes a range of clusters on disk.
 *
 * Length fields are divided into interior and leaf node versions.
 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
 */
struct ocfs2_extent_rec {
/*00*/	__le32 e_cpos;		/* Offset into the file, in clusters */
	union {
		__le32 e_int_clusters; /* Clusters covered by all children */
		struct {
			__le16 e_leaf_clusters; /* Clusters covered by this
						   extent */
			__u8 e_reserved1;
			__u8 e_flags; /* Extent flags */
		};
	};
	__le64 e_blkno;		/* Physical disk offset, in blocks */
/*10*/
};

struct ocfs2_chain_rec {
	__le32 c_free;	/* Number of free bits in this chain. */
	__le32 c_total;	/* Number of total bits in this chain */
	__le64 c_blkno;	/* Physical disk offset (blocks) of 1st group */
};

struct ocfs2_truncate_rec {
	__le32 t_start;		/* 1st cluster in this log */
	__le32 t_clusters;	/* Number of total clusters covered */
};

/*
 * On disk extent list for OCFS2 (node in the tree).  Note that this
 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
 * offsets are relative to ocfs2_dinode.id2.i_list or
 * ocfs2_extent_block.h_list, respectively.
 */
struct ocfs2_extent_list {
/*00*/	__le16 l_tree_depth;		/* Extent tree depth from this
					   point.  0 means data extents
					   hang directly off this
					   header (a leaf)
					   NOTE: The high 8 bits cannot be
					   used - tree_depth is never that big.
					*/
	__le16 l_count;			/* Number of extent records */
	__le16 l_next_free_rec;		/* Next unused extent slot */
	__le16 l_reserved1;
	__le64 l_reserved2;		/* Pad to
					   sizeof(ocfs2_extent_rec) */
/*10*/	struct ocfs2_extent_rec l_recs[0];	/* Extent records */
};

/*
 * On disk allocation chain list for OCFS2.  Note that this is
 * contained inside ocfs2_dinode, so the offsets are relative to
 * ocfs2_dinode.id2.i_chain.
 */
struct ocfs2_chain_list {
/*00*/	__le16 cl_cpg;			/* Clusters per Block Group */
	__le16 cl_bpc;			/* Bits per cluster */
	__le16 cl_count;		/* Total chains in this list */
	__le16 cl_next_free_rec;	/* Next unused chain slot */
	__le64 cl_reserved1;
/*10*/	struct ocfs2_chain_rec cl_recs[0];	/* Chain records */
};

/*
 * On disk deallocation log for OCFS2.  Note that this is
 * contained inside ocfs2_dinode, so the offsets are relative to
 * ocfs2_dinode.id2.i_dealloc.
 */
struct ocfs2_truncate_log {
/*00*/	__le16 tl_count;		/* Total records in this log */
	__le16 tl_used;			/* Number of records in use */
	__le32 tl_reserved1;
/*08*/	struct ocfs2_truncate_rec tl_recs[0];	/* Truncate records */
};

/*
 * On disk extent block (indirect block) for OCFS2
 */
struct ocfs2_extent_block
{
/*00*/	__u8 h_signature[8];		/* Signature for verification */
	struct ocfs2_block_check h_check;	/* Error checking */
/*10*/	__le16 h_suballoc_slot;		/* Slot suballocator this
					   extent_header belongs to */
	__le16 h_suballoc_bit;		/* Bit offset in suballocator
					   block group */
	__le32 h_fs_generation;		/* Must match super block */
	__le64 h_blkno;			/* Offset on disk, in blocks */
/*20*/	__le64 h_suballoc_loc;		/* Suballocator block group this
					   eb belongs to.  Only valid
					   if allocated from a
					   discontiguous block group */
	__le64 h_next_leaf_blk;		/* Offset on disk, in blocks,
					   of next leaf header pointing
					   to data */
/*30*/	struct ocfs2_extent_list h_list;	/* Extent record list */
/* Actual on-disk size is one block */
};

/*
 * On disk slot map for OCFS2.  This defines the contents of the "slot_map"
 * system file.  A slot is valid if it contains a node number >= 0.  The
 * value -1 (0xFFFF) is OCFS2_INVALID_SLOT.  This marks a slot empty.
 */
struct ocfs2_slot_map {
/*00*/	__le16 sm_slots[0];
/*
 * Actual on-disk size is one block.  OCFS2_MAX_SLOTS is 255,
 * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
 */
};

struct ocfs2_extended_slot {
/*00*/	__u8	es_valid;
	__u8	es_reserved1[3];
	__le32	es_node_num;
/*10*/
};

/*
 * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
 * is set.  It separates out the valid marker from the node number, and
 * has room to grow.  Unlike the old slot map, this format is defined by
 * i_size.
 */
struct ocfs2_slot_map_extended {
/*00*/	struct ocfs2_extended_slot se_slots[0];
/*
 * Actual size is i_size of the slot_map system file.  It should
 * match s_max_slots * sizeof(struct ocfs2_extended_slot)
 */
};

/*
 * ci_stackflags is only valid if the incompat bit
 * OCFS2_FEATURE_INCOMPAT_CLUSTERINFO is set.
 */
struct ocfs2_cluster_info {
/*00*/	__u8   ci_stack[OCFS2_STACK_LABEL_LEN];
	union {
		__le32 ci_reserved;
		struct {
			__u8 ci_stackflags;
			__u8 ci_reserved1;
			__u8 ci_reserved2;
			__u8 ci_reserved3;
		};
	};
/*08*/	__u8   ci_cluster[OCFS2_CLUSTER_NAME_LEN];
/*18*/
};

/*
 * On disk superblock for OCFS2
 * Note that it is contained inside an ocfs2_dinode, so all offsets
 * are relative to the start of ocfs2_dinode.id2.
 */
struct ocfs2_super_block {
/*00*/	__le16 s_major_rev_level;
	__le16 s_minor_rev_level;
	__le16 s_mnt_count;
	__le16 s_max_mnt_count;
	__le16 s_state;			/* File system state */
	__le16 s_errors;			/* Behaviour when detecting errors */
	__le32 s_checkinterval;		/* Max time between checks */
/*10*/	__le64 s_lastcheck;		/* Time of last check */
	__le32 s_creator_os;		/* OS */
	__le32 s_feature_compat;		/* Compatible feature set */
/*20*/	__le32 s_feature_incompat;	/* Incompatible feature set */
	__le32 s_feature_ro_compat;	/* Readonly-compatible feature set */
	__le64 s_root_blkno;		/* Offset, in blocks, of root directory
					   dinode */
/*30*/	__le64 s_system_dir_blkno;	/* Offset, in blocks, of system
					   directory dinode */
	__le32 s_blocksize_bits;		/* Blocksize for this fs */
	__le32 s_clustersize_bits;	/* Clustersize for this fs */
/*40*/	__le16 s_max_slots;		/* Max number of simultaneous mounts
					   before tunefs required */
	__le16 s_tunefs_flag;
	__le32 s_uuid_hash;		/* hash value of uuid */
	__le64 s_first_cluster_group;	/* Block offset of 1st cluster
					 * group header */
/*50*/	__u8  s_label[OCFS2_MAX_VOL_LABEL_LEN];	/* Label for mounting, etc. */
/*90*/	__u8  s_uuid[OCFS2_VOL_UUID_LEN];	/* 128-bit uuid */
/*A0*/  struct ocfs2_cluster_info s_cluster_info; /* Only valid if either
						     userspace or clusterinfo
						     INCOMPAT flag set. */
/*B8*/	__le16 s_xattr_inline_size;	/* extended attribute inline size
					   for this fs*/
	__le16 s_reserved0;
	__le32 s_dx_seed[3];		/* seed[0-2] for dx dir hash.
					 * s_uuid_hash serves as seed[3]. */
/*C0*/  __le64 s_reserved2[15];		/* Fill out superblock */
/*140*/

	/*
	 * NOTE: As stated above, all offsets are relative to
	 * ocfs2_dinode.id2, which is at 0xC0 in the inode.
	 * 0xC0 + 0x140 = 0x200 or 512 bytes.  A superblock must fit within
	 * our smallest blocksize, which is 512 bytes.  To ensure this,
	 * we reserve the space in s_reserved2.  Anything past s_reserved2
	 * will not be available on the smallest blocksize.
	 */
};

/*
 * Local allocation bitmap for OCFS2 slots
 * Note that it exists inside an ocfs2_dinode, so all offsets are
 * relative to the start of ocfs2_dinode.id2.
 */
struct ocfs2_local_alloc
{
/*00*/	__le32 la_bm_off;	/* Starting bit offset in main bitmap */
	__le16 la_size;		/* Size of included bitmap, in bytes */
	__le16 la_reserved1;
	__le64 la_reserved2;
/*10*/	__u8   la_bitmap[0];
};

/*
 * Data-in-inode header. This is only used if i_dyn_features has
 * OCFS2_INLINE_DATA_FL set.
 */
struct ocfs2_inline_data
{
/*00*/	__le16	id_count;	/* Number of bytes that can be used
				 * for data, starting at id_data */
	__le16	id_reserved0;
	__le32	id_reserved1;
	__u8	id_data[0];	/* Start of user data */
};

/*
 * On disk inode for OCFS2
 */
struct ocfs2_dinode {
/*00*/	__u8 i_signature[8];		/* Signature for validation */
	__le32 i_generation;		/* Generation number */
	__le16 i_suballoc_slot;		/* Slot suballocator this inode
					   belongs to */
	__le16 i_suballoc_bit;		/* Bit offset in suballocator
					   block group */
/*10*/	__le16 i_links_count_hi;	/* High 16 bits of links count */
	__le16 i_xattr_inline_size;
	__le32 i_clusters;		/* Cluster count */
	__le32 i_uid;			/* Owner UID */
	__le32 i_gid;			/* Owning GID */
/*20*/	__le64 i_size;			/* Size in bytes */
	__le16 i_mode;			/* File mode */
	__le16 i_links_count;		/* Links count */
	__le32 i_flags;			/* File flags */
/*30*/	__le64 i_atime;			/* Access time */
	__le64 i_ctime;			/* Creation time */
/*40*/	__le64 i_mtime;			/* Modification time */
	__le64 i_dtime;			/* Deletion time */
/*50*/	__le64 i_blkno;			/* Offset on disk, in blocks */
	__le64 i_last_eb_blk;		/* Pointer to last extent
					   block */
/*60*/	__le32 i_fs_generation;		/* Generation per fs-instance */
	__le32 i_atime_nsec;
	__le32 i_ctime_nsec;
	__le32 i_mtime_nsec;
/*70*/	__le32 i_attr;
	__le16 i_orphaned_slot;		/* Only valid when OCFS2_ORPHANED_FL
					   was set in i_flags */
	__le16 i_dyn_features;
	__le64 i_xattr_loc;
/*80*/	struct ocfs2_block_check i_check;	/* Error checking */
/*88*/	__le64 i_dx_root;		/* Pointer to dir index root block */
/*90*/	__le64 i_refcount_loc;
	__le64 i_suballoc_loc;		/* Suballocator block group this
					   inode belongs to.  Only valid
					   if allocated from a
					   discontiguous block group */
/*A0*/	__le64 i_reserved2[3];
/*B8*/	union {
		__le64 i_pad1;		/* Generic way to refer to this
					   64bit union */
		struct {
			__le64 i_rdev;	/* Device number */
		} dev1;
		struct {		/* Info for bitmap system
					   inodes */
			__le32 i_used;	/* Bits (ie, clusters) used  */
			__le32 i_total;	/* Total bits (clusters)
					   available */
		} bitmap1;
		struct {		/* Info for journal system
					   inodes */
			__le32 ij_flags;	/* Mounted, version, etc. */
			__le32 ij_recovery_generation; /* Incremented when the
							  journal is recovered
							  after an unclean
							  shutdown */
		} journal1;
	} id1;				/* Inode type dependant 1 */
/*C0*/	union {
		struct ocfs2_super_block	i_super;
		struct ocfs2_local_alloc	i_lab;
		struct ocfs2_chain_list		i_chain;
		struct ocfs2_extent_list	i_list;
		struct ocfs2_truncate_log	i_dealloc;
		struct ocfs2_inline_data	i_data;
		__u8               		i_symlink[0];
	} id2;
/* Actual on-disk size is one block */
};

/*
 * On-disk directory entry structure for OCFS2
 *
 * Packed as this structure could be accessed unaligned on 64-bit platforms
 */
struct ocfs2_dir_entry {
/*00*/	__le64   inode;                  /* Inode number */
	__le16   rec_len;                /* Directory entry length */
	__u8    name_len;               /* Name length */
	__u8    file_type;
/*0C*/	char    name[OCFS2_MAX_FILENAME_LEN];   /* File name */
/* Actual on-disk length specified by rec_len */
} __attribute__ ((packed));

/*
 * Per-block record for the unindexed directory btree. This is carefully
 * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are
 * mirrored. That way, the directory manipulation code needs a minimal amount
 * of update.
 *
 * NOTE: Keep this structure aligned to a multiple of 4 bytes.
 */
struct ocfs2_dir_block_trailer {
/*00*/	__le64		db_compat_inode;	/* Always zero. Was inode */

	__le16		db_compat_rec_len;	/* Backwards compatible with
						 * ocfs2_dir_entry. */
	__u8		db_compat_name_len;	/* Always zero. Was name_len */
	__u8		db_reserved0;
	__le16		db_reserved1;
	__le16		db_free_rec_len;	/* Size of largest empty hole
						 * in this block. (unused) */
/*10*/	__u8		db_signature[8];	/* Signature for verification */
	__le64		db_reserved2;
	__le64		db_free_next;		/* Next block in list (unused) */
/*20*/	__le64		db_blkno;		/* Offset on disk, in blocks */
	__le64		db_parent_dinode;	/* dinode which owns me, in
						   blocks */
/*30*/	struct ocfs2_block_check db_check;	/* Error checking */
/*40*/
};

 /*
 * A directory entry in the indexed tree. We don't store the full name here,
 * but instead provide a pointer to the full dirent in the unindexed tree.
 *
 * We also store name_len here so as to reduce the number of leaf blocks we
 * need to search in case of collisions.
 */
struct ocfs2_dx_entry {
	__le32		dx_major_hash;	/* Used to find logical
					 * cluster in index */
	__le32		dx_minor_hash;	/* Lower bits used to find
					 * block in cluster */
	__le64		dx_dirent_blk;	/* Physical block in unindexed
					 * tree holding this dirent. */
};

struct ocfs2_dx_entry_list {
	__le32		de_reserved;
	__le16		de_count;	/* Maximum number of entries
					 * possible in de_entries */
	__le16		de_num_used;	/* Current number of
					 * de_entries entries */
	struct	ocfs2_dx_entry		de_entries[0];	/* Indexed dir entries
							 * in a packed array of
							 * length de_num_used */
};

#define OCFS2_DX_FLAG_INLINE	0x01

/*
 * A directory indexing block. Each indexed directory has one of these,
 * pointed to by ocfs2_dinode.
 *
 * This block stores an indexed btree root, and a set of free space
 * start-of-list pointers.
 */
struct ocfs2_dx_root_block {
	__u8		dr_signature[8];	/* Signature for verification */
	struct ocfs2_block_check dr_check;	/* Error checking */
	__le16		dr_suballoc_slot;	/* Slot suballocator this
						 * block belongs to. */
	__le16		dr_suballoc_bit;	/* Bit offset in suballocator
						 * block group */
	__le32		dr_fs_generation;	/* Must match super block */
	__le64		dr_blkno;		/* Offset on disk, in blocks */
	__le64		dr_last_eb_blk;		/* Pointer to last
						 * extent block */
	__le32		dr_clusters;		/* Clusters allocated
						 * to the indexed tree. */
	__u8		dr_flags;		/* OCFS2_DX_FLAG_* flags */
	__u8		dr_reserved0;
	__le16		dr_reserved1;
	__le64		dr_dir_blkno;		/* Pointer to parent inode */
	__le32		dr_num_entries;		/* Total number of
						 * names stored in
						 * this directory.*/
	__le32		dr_reserved2;
	__le64		dr_free_blk;		/* Pointer to head of free
						 * unindexed block list. */
	__le64		dr_suballoc_loc;	/* Suballocator block group
						   this root belongs to.
						   Only valid if allocated
						   from a discontiguous
						   block group */
	__le64		dr_reserved3[14];
	union {
		struct ocfs2_extent_list dr_list; /* Keep this aligned to 128
						   * bits for maximum space
						   * efficiency. */
		struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of
							* entries. We grow out
							* to extents if this
							* gets too big. */
	};
};

/*
 * The header of a leaf block in the indexed tree.
 */
struct ocfs2_dx_leaf {
	__u8		dl_signature[8];/* Signature for verification */
	struct ocfs2_block_check dl_check;	/* Error checking */
	__le64		dl_blkno;	/* Offset on disk, in blocks */
	__le32		dl_fs_generation;/* Must match super block */
	__le32		dl_reserved0;
	__le64		dl_reserved1;
	struct ocfs2_dx_entry_list	dl_list;
};

/*
 * Largest bitmap for a block (suballocator) group in bytes.  This limit
 * does not affect cluster groups (global allocator).  Cluster group
 * bitmaps run to the end of the block.
 */
#define OCFS2_MAX_BG_BITMAP_SIZE	256

/*
 * On disk allocator group structure for OCFS2
 */
struct ocfs2_group_desc
{
/*00*/	__u8    bg_signature[8];        /* Signature for validation */
	__le16   bg_size;                /* Size of included bitmap in
					   bytes. */
	__le16   bg_bits;                /* Bits represented by this
					   group. */
	__le16	bg_free_bits_count;     /* Free bits count */
	__le16   bg_chain;               /* What chain I am in. */
/*10*/	__le32   bg_generation;
	__le32	bg_reserved1;
	__le64   bg_next_group;          /* Next group in my list, in
					   blocks */
/*20*/	__le64   bg_parent_dinode;       /* dinode which owns me, in
					   blocks */
	__le64   bg_blkno;               /* Offset on disk, in blocks */
/*30*/	struct ocfs2_block_check bg_check;	/* Error checking */
	__le64   bg_reserved2;
/*40*/	union {
		__u8    bg_bitmap[0];
		struct {
			/*
			 * Block groups may be discontiguous when
			 * OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG is set.
			 * The extents of a discontigous block group are
			 * stored in bg_list.  It is a flat list.
			 * l_tree_depth must always be zero.  A
			 * discontiguous group is signified by a non-zero
			 * bg_list->l_next_free_rec.  Only block groups
			 * can be discontiguous; Cluster groups cannot.
			 * We've never made a block group with more than
			 * 2048 blocks (256 bytes of bg_bitmap).  This
			 * codifies that limit so that we can fit bg_list.
			 * bg_size of a discontiguous block group will
			 * be 256 to match bg_bitmap_filler.
			 */
			__u8 bg_bitmap_filler[OCFS2_MAX_BG_BITMAP_SIZE];
/*140*/			struct ocfs2_extent_list bg_list;
		};
	};
/* Actual on-disk size is one block */
};

struct ocfs2_refcount_rec {
/*00*/	__le64 r_cpos;		/* Physical offset, in clusters */
	__le32 r_clusters;	/* Clusters covered by this extent */
	__le32 r_refcount;	/* Reference count of this extent */
/*10*/
};
#define OCFS2_32BIT_POS_MASK		(0xffffffffULL)

#define OCFS2_REFCOUNT_LEAF_FL          (0x00000001)
#define OCFS2_REFCOUNT_TREE_FL          (0x00000002)

struct ocfs2_refcount_list {
/*00*/	__le16 rl_count;	/* Maximum number of entries possible
				   in rl_records */
	__le16 rl_used;		/* Current number of used records */
	__le32 rl_reserved2;
	__le64 rl_reserved1;	/* Pad to sizeof(ocfs2_refcount_record) */
/*10*/	struct ocfs2_refcount_rec rl_recs[0];	/* Refcount records */
};


struct ocfs2_refcount_block {
/*00*/	__u8 rf_signature[8];		/* Signature for verification */
	__le16 rf_suballoc_slot;	/* Slot suballocator this block
					   belongs to */
	__le16 rf_suballoc_bit;		/* Bit offset in suballocator
					   block group */
	__le32 rf_fs_generation;	/* Must match superblock */
/*10*/	__le64 rf_blkno;		/* Offset on disk, in blocks */
	__le64 rf_parent;		/* Parent block, only valid if
					   OCFS2_REFCOUNT_LEAF_FL is set in
					   rf_flags */
/*20*/	struct ocfs2_block_check rf_check;	/* Error checking */
	__le64 rf_last_eb_blk;		/* Pointer to last extent block */
/*30*/	__le32 rf_count;		/* Number of inodes sharing this
					   refcount tree */
	__le32 rf_flags;		/* See the flags above */
	__le32 rf_clusters;		/* clusters covered by refcount tree. */
	__le32 rf_cpos;			/* cluster offset in refcount tree.*/
/*40*/	__le32 rf_generation;		/* generation number. all be the same
					 * for the same refcount tree. */
	__le32 rf_reserved0;
	__le64 rf_suballoc_loc;		/* Suballocator block group this
					   refcount block belongs to. Only
					   valid if allocated from a
					   discontiguous block group */
/*50*/	__le64 rf_reserved1[6];
/*80*/	union {
		struct ocfs2_refcount_list rf_records;  /* List of refcount
							  records */
		struct ocfs2_extent_list rf_list;	/* Extent record list,
							only valid if
							OCFS2_REFCOUNT_TREE_FL
							is set in rf_flags */
	};
/* Actual on-disk size is one block */
};

/*
 * On disk extended attribute structure for OCFS2.
 */

/*
 * ocfs2_xattr_entry indicates one extend attribute.
 *
 * Note that it can be stored in inode, one block or one xattr bucket.
 */
struct ocfs2_xattr_entry {
	__le32	xe_name_hash;    /* hash value of xattr prefix+suffix. */
	__le16	xe_name_offset;  /* byte offset from the 1st entry in the
				    local xattr storage(inode, xattr block or
				    xattr bucket). */
	__u8	xe_name_len;	 /* xattr name len, does't include prefix. */
	__u8	xe_type;         /* the low 7 bits indicate the name prefix
				  * type and the highest bit indicates whether
				  * the EA is stored in the local storage. */
	__le64	xe_value_size;	 /* real xattr value length. */
};

/*
 * On disk structure for xattr header.
 *
 * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in
 * the local xattr storage.
 */
struct ocfs2_xattr_header {
	__le16	xh_count;                       /* contains the count of how
						   many records are in the
						   local xattr storage. */
	__le16	xh_free_start;                  /* current offset for storing
						   xattr. */
	__le16	xh_name_value_len;              /* total length of name/value
						   length in this bucket. */
	__le16	xh_num_buckets;                 /* Number of xattr buckets
						   in this extent record,
						   only valid in the first
						   bucket. */
	struct ocfs2_block_check xh_check;	/* Error checking
						   (Note, this is only
						    used for xattr
						    buckets.  A block uses
						    xb_check and sets
						    this field to zero.) */
	struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
};

/*
 * On disk structure for xattr value root.
 *
 * When an xattr's value is large enough, it is stored in an external
 * b-tree like file data.  The xattr value root points to this structure.
 */
struct ocfs2_xattr_value_root {
/*00*/	__le32	xr_clusters;              /* clusters covered by xattr value. */
	__le32	xr_reserved0;
	__le64	xr_last_eb_blk;           /* Pointer to last extent block */
/*10*/	struct ocfs2_extent_list xr_list; /* Extent record list */
};

/*
 * On disk structure for xattr tree root.
 *
 * It is used when there are too many extended attributes for one file. These
 * attributes will be organized and stored in an indexed-btree.
 */
struct ocfs2_xattr_tree_root {
/*00*/	__le32	xt_clusters;              /* clusters covered by xattr. */
	__le32	xt_reserved0;
	__le64	xt_last_eb_blk;           /* Pointer to last extent block */
/*10*/	struct ocfs2_extent_list xt_list; /* Extent record list */
};

#define OCFS2_XATTR_INDEXED	0x1
#define OCFS2_HASH_SHIFT	5
#define OCFS2_XATTR_ROUND	3
#define OCFS2_XATTR_SIZE(size)	(((size) + OCFS2_XATTR_ROUND) & \
				~(OCFS2_XATTR_ROUND))

#define OCFS2_XATTR_BUCKET_SIZE			4096
#define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET 	(OCFS2_XATTR_BUCKET_SIZE \
						 / OCFS2_MIN_BLOCKSIZE)

/*
 * On disk structure for xattr block.
 */
struct ocfs2_xattr_block {
/*00*/	__u8	xb_signature[8];     /* Signature for verification */
	__le16	xb_suballoc_slot;    /* Slot suballocator this
					block belongs to. */
	__le16	xb_suballoc_bit;     /* Bit offset in suballocator
					block group */
	__le32	xb_fs_generation;    /* Must match super block */
/*10*/	__le64	xb_blkno;            /* Offset on disk, in blocks */
	struct ocfs2_block_check xb_check;	/* Error checking */
/*20*/	__le16	xb_flags;            /* Indicates whether this block contains
					real xattr or a xattr tree. */
	__le16	xb_reserved0;
	__le32  xb_reserved1;
	__le64	xb_suballoc_loc;	/* Suballocator block group this
					   xattr block belongs to. Only
					   valid if allocated from a
					   discontiguous block group */
/*30*/	union {
		struct ocfs2_xattr_header xb_header; /* xattr header if this
							block contains xattr */
		struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this
							block cotains xattr
							tree. */
	} xb_attrs;
};

#define OCFS2_XATTR_ENTRY_LOCAL		0x80
#define OCFS2_XATTR_TYPE_MASK		0x7F
static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe,
					 int local)
{
	if (local)
		xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL;
	else
		xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL;
}

static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
{
	return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
}

static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type)
{
	xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK;
}

static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
{
	return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
}

/*
 *  On disk structures for global quota file
 */

/* Magic numbers and known versions for global quota files */
#define OCFS2_GLOBAL_QMAGICS {\
	0x0cf52470, /* USRQUOTA */ \
	0x0cf52471  /* GRPQUOTA */ \
}

#define OCFS2_GLOBAL_QVERSIONS {\
	0, \
	0, \
}


/* Each block of each quota file has a certain fixed number of bytes reserved
 * for OCFS2 internal use at its end. OCFS2 can use it for things like
 * checksums, etc. */
#define OCFS2_QBLK_RESERVED_SPACE 8

/* Generic header of all quota files */
struct ocfs2_disk_dqheader {
	__le32 dqh_magic;	/* Magic number identifying file */
	__le32 dqh_version;	/* Quota format version */
};

#define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))

/* Information header of global quota file (immediately follows the generic
 * header) */
struct ocfs2_global_disk_dqinfo {
/*00*/	__le32 dqi_bgrace;	/* Grace time for space softlimit excess */
	__le32 dqi_igrace;	/* Grace time for inode softlimit excess */
	__le32 dqi_syncms;	/* Time after which we sync local changes to
				 * global quota file */
	__le32 dqi_blocks;	/* Number of blocks in quota file */
/*10*/	__le32 dqi_free_blk;	/* First free block in quota file */
	__le32 dqi_free_entry;	/* First block with free dquot entry in quota
				 * file */
};

/* Structure with global user / group information. We reserve some space
 * for future use. */
struct ocfs2_global_disk_dqblk {
/*00*/	__le32 dqb_id;          /* ID the structure belongs to */
	__le32 dqb_use_count;   /* Number of nodes having reference to this structure */
	__le64 dqb_ihardlimit;  /* absolute limit on allocated inodes */
/*10*/	__le64 dqb_isoftlimit;  /* preferred inode limit */
	__le64 dqb_curinodes;   /* current # allocated inodes */
/*20*/	__le64 dqb_bhardlimit;  /* absolute limit on disk space */
	__le64 dqb_bsoftlimit;  /* preferred limit on disk space */
/*30*/	__le64 dqb_curspace;    /* current space occupied */
	__le64 dqb_btime;       /* time limit for excessive disk use */
/*40*/	__le64 dqb_itime;       /* time limit for excessive inode use */
	__le64 dqb_pad1;
/*50*/	__le64 dqb_pad2;
};

/*
 *  On-disk structures for local quota file
 */

/* Magic numbers and known versions for local quota files */
#define OCFS2_LOCAL_QMAGICS {\
	0x0cf524c0, /* USRQUOTA */ \
	0x0cf524c1  /* GRPQUOTA */ \
}

#define OCFS2_LOCAL_QVERSIONS {\
	0, \
	0, \
}

/* Quota flags in dqinfo header */
#define OLQF_CLEAN	0x0001	/* Quota file is empty (this should be after\
				 * quota has been cleanly turned off) */

#define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))

/* Information header of local quota file (immediately follows the generic
 * header) */
struct ocfs2_local_disk_dqinfo {
	__le32 dqi_flags;	/* Flags for quota file */
	__le32 dqi_chunks;	/* Number of chunks of quota structures
				 * with a bitmap */
	__le32 dqi_blocks;	/* Number of blocks allocated for quota file */
};

/* Header of one chunk of a quota file */
struct ocfs2_local_disk_chunk {
	__le32 dqc_free;	/* Number of free entries in the bitmap */
	__u8 dqc_bitmap[0];	/* Bitmap of entries in the corresponding
				 * chunk of quota file */
};

/* One entry in local quota file */
struct ocfs2_local_disk_dqblk {
/*00*/	__le64 dqb_id;		/* id this quota applies to */
	__le64 dqb_spacemod;	/* Change in the amount of used space */
/*10*/	__le64 dqb_inodemod;	/* Change in the amount of used inodes */
};


/*
 * The quota trailer lives at the end of each quota block.
 */

struct ocfs2_disk_dqtrailer {
/*00*/	struct ocfs2_block_check dq_check;	/* Error checking */
/*08*/	/* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */
};

static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize,
								 void *buf)
{
	char *ptr = buf;
	ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE;

	return (struct ocfs2_disk_dqtrailer *)ptr;
}

#ifdef __KERNEL__
static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
{
	return  sb->s_blocksize -
		 offsetof(struct ocfs2_dinode, id2.i_symlink);
}

static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb,
						   struct ocfs2_dinode *di)
{
	unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);

	if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
		return sb->s_blocksize -
			offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
			xattrsize;
	else
		return sb->s_blocksize -
			offsetof(struct ocfs2_dinode, id2.i_data.id_data);
}

static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_dinode, id2.i_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline int ocfs2_extent_recs_per_inode_with_xattr(
						struct super_block *sb,
						struct ocfs2_dinode *di)
{
	int size;
	unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);

	if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
		size = sb->s_blocksize -
			offsetof(struct ocfs2_dinode, id2.i_list.l_recs) -
			xattrsize;
	else
		size = sb->s_blocksize -
			offsetof(struct ocfs2_dinode, id2.i_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_dx_root_block, dr_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);

	return size / sizeof(struct ocfs2_chain_rec);
}

static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_extent_block, h_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline u16 ocfs2_extent_recs_per_gd(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_group_desc, bg_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_dx_leaf, dl_list.de_entries);

	return size / sizeof(struct ocfs2_dx_entry);
}

static inline int ocfs2_dx_entries_per_root(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries);

	return size / sizeof(struct ocfs2_dx_entry);
}

static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
{
	u16 size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);

	return size;
}

static inline int ocfs2_group_bitmap_size(struct super_block *sb,
					  int suballocator,
					  u32 feature_incompat)
{
	int size = sb->s_blocksize -
		offsetof(struct ocfs2_group_desc, bg_bitmap);

	/*
	 * The cluster allocator uses the entire block.  Suballocators have
	 * never used more than OCFS2_MAX_BG_BITMAP_SIZE.  Unfortunately, older
	 * code expects bg_size set to the maximum.  Thus we must keep
	 * bg_size as-is unless discontig_bg is enabled.
	 */
	if (suballocator &&
	    (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
		size = OCFS2_MAX_BG_BITMAP_SIZE;

	return size;
}

static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);

	return size / sizeof(struct ocfs2_truncate_rec);
}

static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
{
	u64 offset = OCFS2_BACKUP_SB_START;

	if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
		offset <<= (2 * index);
		offset >>= sb->s_blocksize_bits;
		return offset;
	}

	return 0;

}

static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_xattr_block,
			 xb_attrs.xb_root.xt_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_refcount_block, rf_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb)
{
	int size;

	size = sb->s_blocksize -
		offsetof(struct ocfs2_refcount_block, rf_records.rl_recs);

	return size / sizeof(struct ocfs2_refcount_rec);
}

static inline u32
ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec)
{
	return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
}
#else
static inline int ocfs2_fast_symlink_chars(int blocksize)
{
	return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
}

static inline int ocfs2_max_inline_data_with_xattr(int blocksize,
						   struct ocfs2_dinode *di)
{
	if (di && (di->i_dyn_features & OCFS2_INLINE_XATTR_FL))
		return blocksize -
			offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
			di->i_xattr_inline_size;
	else
		return blocksize -
			offsetof(struct ocfs2_dinode, id2.i_data.id_data);
}

static inline int ocfs2_extent_recs_per_inode(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_dinode, id2.i_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline int ocfs2_chain_recs_per_inode(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);

	return size / sizeof(struct ocfs2_chain_rec);
}

static inline int ocfs2_extent_recs_per_eb(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_extent_block, h_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline int ocfs2_extent_recs_per_gd(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_group_desc, bg_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}

static inline int ocfs2_local_alloc_size(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);

	return size;
}

static inline int ocfs2_group_bitmap_size(int blocksize,
					  int suballocator,
					  uint32_t feature_incompat)
{
	int size = sb->s_blocksize -
		offsetof(struct ocfs2_group_desc, bg_bitmap);

	/*
	 * The cluster allocator uses the entire block.  Suballocators have
	 * never used more than OCFS2_MAX_BG_BITMAP_SIZE.  Unfortunately, older
	 * code expects bg_size set to the maximum.  Thus we must keep
	 * bg_size as-is unless discontig_bg is enabled.
	 */
	if (suballocator &&
	    (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
		size = OCFS2_MAX_BG_BITMAP_SIZE;

	return size;
}

static inline int ocfs2_truncate_recs_per_inode(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);

	return size / sizeof(struct ocfs2_truncate_rec);
}

static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
{
	uint64_t offset = OCFS2_BACKUP_SB_START;

	if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
		offset <<= (2 * index);
		offset /= blocksize;
		return offset;
	}

	return 0;
}

static inline int ocfs2_xattr_recs_per_xb(int blocksize)
{
	int size;

	size = blocksize -
		offsetof(struct ocfs2_xattr_block,
			 xb_attrs.xb_root.xt_list.l_recs);

	return size / sizeof(struct ocfs2_extent_rec);
}
#endif  /* __KERNEL__ */


static inline int ocfs2_system_inode_is_global(int type)
{
	return ((type >= 0) &&
		(type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
}

static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
						  int type, int slot)
{
	int chars;

        /*
         * Global system inodes can only have one copy.  Everything
         * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
         * list has a copy per slot.
         */
	if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
		chars = snprintf(buf, len, "%s",
				 ocfs2_system_inodes[type].si_name);
	else
		chars = snprintf(buf, len,
				 ocfs2_system_inodes[type].si_name,
				 slot);

	return chars;
}

static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
				    umode_t mode)
{
	de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
}

static inline int ocfs2_gd_is_discontig(struct ocfs2_group_desc *gd)
{
	if ((offsetof(struct ocfs2_group_desc, bg_bitmap) +
	     le16_to_cpu(gd->bg_size)) !=
	    offsetof(struct ocfs2_group_desc, bg_list))
		return 0;
	/*
	 * Only valid to check l_next_free_rec if
	 * bg_bitmap + bg_size == bg_list.
	 */
	if (!gd->bg_list.l_next_free_rec)
		return 0;
	return 1;
}
#endif  /* _OCFS2_FS_H */