summaryrefslogtreecommitdiffstats
path: root/fs/isofs/inode.c
blob: bfdeb82a53be09e848a74b75bbb3178a9881b352 (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
/*
 *  linux/fs/isofs/inode.c
 *
 *  (C) 1991  Linus Torvalds - minix filesystem
 *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
 *      1994  Eberhard Mönkeberg - multi session handling.
 *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
 *	1997  Gordon Chaffee - Joliet CDs
 *	1998  Eric Lammerts - ISO 9660 Level 3
 *	2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
 *	2004  Paul Serice - NFS Export Operations
 */

#include <linux/init.h>
#include <linux/module.h>

#include <linux/slab.h>
#include <linux/nls.h>
#include <linux/ctype.h>
#include <linux/statfs.h>
#include <linux/cdrom.h>
#include <linux/parser.h>

#include "isofs.h"
#include "zisofs.h"

#define BEQUIET

static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
static int isofs_hash(struct dentry *parent, struct qstr *qstr);
static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);

#ifdef CONFIG_JOLIET
static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
#endif

static void isofs_put_super(struct super_block *sb)
{
	struct isofs_sb_info *sbi = ISOFS_SB(sb);

#ifdef CONFIG_JOLIET
	unload_nls(sbi->s_nls_iocharset);
#endif

	kfree(sbi);
	sb->s_fs_info = NULL;
	return;
}

static int isofs_read_inode(struct inode *);
static int isofs_statfs (struct dentry *, struct kstatfs *);

static struct kmem_cache *isofs_inode_cachep;

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

static void isofs_destroy_inode(struct inode *inode)
{
	kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
}

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

	inode_init_once(&ei->vfs_inode);
}

static int init_inodecache(void)
{
	isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
					sizeof(struct iso_inode_info),
					0, (SLAB_RECLAIM_ACCOUNT|
					SLAB_MEM_SPREAD),
					init_once);
	if (isofs_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

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

static int isofs_remount(struct super_block *sb, int *flags, char *data)
{
	/* we probably want a lot more here */
	*flags |= MS_RDONLY;
	return 0;
}

static const struct super_operations isofs_sops = {
	.alloc_inode	= isofs_alloc_inode,
	.destroy_inode	= isofs_destroy_inode,
	.put_super	= isofs_put_super,
	.statfs		= isofs_statfs,
	.remount_fs	= isofs_remount,
	.show_options	= generic_show_options,
};


static const struct dentry_operations isofs_dentry_ops[] = {
	{
		.d_hash		= isofs_hash,
		.d_compare	= isofs_dentry_cmp,
	},
	{
		.d_hash		= isofs_hashi,
		.d_compare	= isofs_dentry_cmpi,
	},
#ifdef CONFIG_JOLIET
	{
		.d_hash		= isofs_hash_ms,
		.d_compare	= isofs_dentry_cmp_ms,
	},
	{
		.d_hash		= isofs_hashi_ms,
		.d_compare	= isofs_dentry_cmpi_ms,
	},
#endif
};

struct iso9660_options{
	unsigned int rock:1;
	unsigned int joliet:1;
	unsigned int cruft:1;
	unsigned int hide:1;
	unsigned int showassoc:1;
	unsigned int nocompress:1;
	unsigned int overriderockperm:1;
	unsigned int uid_set:1;
	unsigned int gid_set:1;
	unsigned int utf8:1;
	unsigned char map;
	unsigned char check;
	unsigned int blocksize;
	mode_t fmode;
	mode_t dmode;
	gid_t gid;
	uid_t uid;
	char *iocharset;
	/* LVE */
	s32 session;
	s32 sbsector;
};

/*
 * Compute the hash for the isofs name corresponding to the dentry.
 */
static int
isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
{
	const char *name;
	int len;

	len = qstr->len;
	name = qstr->name;
	if (ms) {
		while (len && name[len-1] == '.')
			len--;
	}

	qstr->hash = full_name_hash(name, len);

	return 0;
}

/*
 * Compute the hash for the isofs name corresponding to the dentry.
 */
static int
isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
{
	const char *name;
	int len;
	char c;
	unsigned long hash;

	len = qstr->len;
	name = qstr->name;
	if (ms) {
		while (len && name[len-1] == '.')
			len--;
	}

	hash = init_name_hash();
	while (len--) {
		c = tolower(*name++);
		hash = partial_name_hash(c, hash);
	}
	qstr->hash = end_name_hash(hash);

	return 0;
}

/*
 * Case insensitive compare of two isofs names.
 */
static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
				struct qstr *b, int ms)
{
	int alen, blen;

	/* A filename cannot end in '.' or we treat it like it has none */
	alen = a->len;
	blen = b->len;
	if (ms) {
		while (alen && a->name[alen-1] == '.')
			alen--;
		while (blen && b->name[blen-1] == '.')
			blen--;
	}
	if (alen == blen) {
		if (strnicmp(a->name, b->name, alen) == 0)
			return 0;
	}
	return 1;
}

/*
 * Case sensitive compare of two isofs names.
 */
static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
					struct qstr *b, int ms)
{
	int alen, blen;

	/* A filename cannot end in '.' or we treat it like it has none */
	alen = a->len;
	blen = b->len;
	if (ms) {
		while (alen && a->name[alen-1] == '.')
			alen--;
		while (blen && b->name[blen-1] == '.')
			blen--;
	}
	if (alen == blen) {
		if (strncmp(a->name, b->name, alen) == 0)
			return 0;
	}
	return 1;
}

static int
isofs_hash(struct dentry *dentry, struct qstr *qstr)
{
	return isofs_hash_common(dentry, qstr, 0);
}

static int
isofs_hashi(struct dentry *dentry, struct qstr *qstr)
{
	return isofs_hashi_common(dentry, qstr, 0);
}

static int
isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
{
	return isofs_dentry_cmp_common(dentry, a, b, 0);
}

static int
isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
{
	return isofs_dentry_cmpi_common(dentry, a, b, 0);
}

#ifdef CONFIG_JOLIET
static int
isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
{
	return isofs_hash_common(dentry, qstr, 1);
}

static int
isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
{
	return isofs_hashi_common(dentry, qstr, 1);
}

static int
isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
{
	return isofs_dentry_cmp_common(dentry, a, b, 1);
}

static int
isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
{
	return isofs_dentry_cmpi_common(dentry, a, b, 1);
}
#endif

enum {
	Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
	Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
	Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
	Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
};

static const match_table_t tokens = {
	{Opt_norock, "norock"},
	{Opt_nojoliet, "nojoliet"},
	{Opt_unhide, "unhide"},
	{Opt_hide, "hide"},
	{Opt_showassoc, "showassoc"},
	{Opt_cruft, "cruft"},
	{Opt_utf8, "utf8"},
	{Opt_iocharset, "iocharset=%s"},
	{Opt_map_a, "map=acorn"},
	{Opt_map_a, "map=a"},
	{Opt_map_n, "map=normal"},
	{Opt_map_n, "map=n"},
	{Opt_map_o, "map=off"},
	{Opt_map_o, "map=o"},
	{Opt_session, "session=%u"},
	{Opt_sb, "sbsector=%u"},
	{Opt_check_r, "check=relaxed"},
	{Opt_check_r, "check=r"},
	{Opt_check_s, "check=strict"},
	{Opt_check_s, "check=s"},
	{Opt_uid, "uid=%u"},
	{Opt_gid, "gid=%u"},
	{Opt_mode, "mode=%u"},
	{Opt_dmode, "dmode=%u"},
	{Opt_overriderockperm, "overriderockperm"},
	{Opt_block, "block=%u"},
	{Opt_ignore, "conv=binary"},
	{Opt_ignore, "conv=b"},
	{Opt_ignore, "conv=text"},
	{Opt_ignore, "conv=t"},
	{Opt_ignore, "conv=mtext"},
	{Opt_ignore, "conv=m"},
	{Opt_ignore, "conv=auto"},
	{Opt_ignore, "conv=a"},
	{Opt_nocompress, "nocompress"},
	{Opt_err, NULL}
};

static int parse_options(char *options, struct iso9660_options *popt)
{
	char *p;
	int option;

	popt->map = 'n';
	popt->rock = 1;
	popt->joliet = 1;
	popt->cruft = 0;
	popt->hide = 0;
	popt->showassoc = 0;
	popt->check = 'u';		/* unset */
	popt->nocompress = 0;
	popt->blocksize = 1024;
	popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
	popt->uid_set = 0;
	popt->gid_set = 0;
	popt->gid = 0;
	popt->uid = 0;
	popt->iocharset = NULL;
	popt->utf8 = 0;
	popt->overriderockperm = 0;
	popt->session=-1;
	popt->sbsector=-1;
	if (!options)
		return 1;

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

		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_norock:
			popt->rock = 0;
			break;
		case Opt_nojoliet:
			popt->joliet = 0;
			break;
		case Opt_hide:
			popt->hide = 1;
			break;
		case Opt_unhide:
		case Opt_showassoc:
			popt->showassoc = 1;
			break;
		case Opt_cruft:
			popt->cruft = 1;
			break;
		case Opt_utf8:
			popt->utf8 = 1;
			break;
#ifdef CONFIG_JOLIET
		case Opt_iocharset:
			popt->iocharset = match_strdup(&args[0]);
			break;
#endif
		case Opt_map_a:
			popt->map = 'a';
			break;
		case Opt_map_o:
			popt->map = 'o';
			break;
		case Opt_map_n:
			popt->map = 'n';
			break;
		case Opt_session:
			if (match_int(&args[0], &option))
				return 0;
			n = option;
			if (n > 99)
				return 0;
			popt->session = n + 1;
			break;
		case Opt_sb:
			if (match_int(&args[0], &option))
				return 0;
			popt->sbsector = option;
			break;
		case Opt_check_r:
			popt->check = 'r';
			break;
		case Opt_check_s:
			popt->check = 's';
			break;
		case Opt_ignore:
			break;
		case Opt_uid:
			if (match_int(&args[0], &option))
				return 0;
			popt->uid = option;
			popt->uid_set = 1;
			break;
		case Opt_gid:
			if (match_int(&args[0], &option))
				return 0;
			popt->gid = option;
			popt->gid_set = 1;
			break;
		case Opt_mode:
			if (match_int(&args[0], &option))
				return 0;
			popt->fmode = option;
			break;
		case Opt_dmode:
			if (match_int(&args[0], &option))
				return 0;
			popt->dmode = option;
			break;
		case Opt_overriderockperm:
			popt->overriderockperm = 1;
			break;
		case Opt_block:
			if (match_int(&args[0], &option))
				return 0;
			n = option;
			if (n != 512 && n != 1024 && n != 2048)
				return 0;
			popt->blocksize = n;
			break;
		case Opt_nocompress:
			popt->nocompress = 1;
			break;
		default:
			return 0;
		}
	}
	return 1;
}

/*
 * look if the driver can tell the multi session redirection value
 *
 * don't change this if you don't know what you do, please!
 * Multisession is legal only with XA disks.
 * A non-XA disk with more than one volume descriptor may do it right, but
 * usually is written in a nowhere standardized "multi-partition" manner.
 * Multisession uses absolute addressing (solely the first frame of the whole
 * track is #0), multi-partition uses relative addressing (each first frame of
 * each track is #0), and a track is not a session.
 *
 * A broken CDwriter software or drive firmware does not set new standards,
 * at least not if conflicting with the existing ones.
 *
 * emoenke@gwdg.de
 */
#define WE_OBEY_THE_WRITTEN_STANDARDS 1

static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
{
	struct cdrom_multisession ms_info;
	unsigned int vol_desc_start;
	struct block_device *bdev = sb->s_bdev;
	int i;

	vol_desc_start=0;
	ms_info.addr_format=CDROM_LBA;
	if(session >= 0 && session <= 99) {
		struct cdrom_tocentry Te;
		Te.cdte_track=session;
		Te.cdte_format=CDROM_LBA;
		i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
		if (!i) {
			printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
				session, Te.cdte_addr.lba,
				Te.cdte_ctrl&CDROM_DATA_TRACK);
			if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
				return Te.cdte_addr.lba;
		}

		printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
	}
	i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
	if (session > 0)
		printk(KERN_ERR "ISOFS: Invalid session number\n");
#if 0
	printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
	if (i==0) {
		printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
		printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
	}
#endif
	if (i==0)
#if WE_OBEY_THE_WRITTEN_STANDARDS
		if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
#endif
			vol_desc_start=ms_info.addr.lba;
	return vol_desc_start;
}

/*
 * Check if root directory is empty (has less than 3 files).
 *
 * Used to detect broken CDs where ISO root directory is empty but Joliet root
 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
 * (and Joliet used instead) or else no files would be visible.
 */
static bool rootdir_empty(struct super_block *sb, unsigned long block)
{
	int offset = 0, files = 0, de_len;
	struct iso_directory_record *de;
	struct buffer_head *bh;

	bh = sb_bread(sb, block);
	if (!bh)
		return true;
	while (files < 3) {
		de = (struct iso_directory_record *) (bh->b_data + offset);
		de_len = *(unsigned char *) de;
		if (de_len == 0)
			break;
		files++;
		offset += de_len;
	}
	brelse(bh);
	return files < 3;
}

/*
 * Initialize the superblock and read the root inode.
 *
 * Note: a check_disk_change() has been done immediately prior
 * to this call, so we don't need to check again.
 */
static int isofs_fill_super(struct super_block *s, void *data, int silent)
{
	struct buffer_head *bh = NULL, *pri_bh = NULL;
	struct hs_primary_descriptor *h_pri = NULL;
	struct iso_primary_descriptor *pri = NULL;
	struct iso_supplementary_descriptor *sec = NULL;
	struct iso_directory_record *rootp;
	struct inode *inode;
	struct iso9660_options opt;
	struct isofs_sb_info *sbi;
	unsigned long first_data_zone;
	int joliet_level = 0;
	int iso_blknum, block;
	int orig_zonesize;
	int table, error = -EINVAL;
	unsigned int vol_desc_start;

	save_mount_options(s, data);

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;
	s->s_fs_info = sbi;

	if (!parse_options((char *)data, &opt))
		goto out_freesbi;

	/*
	 * First of all, get the hardware blocksize for this device.
	 * If we don't know what it is, or the hardware blocksize is
	 * larger than the blocksize the user specified, then use
	 * that value.
	 */
	/*
	 * What if bugger tells us to go beyond page size?
	 */
	opt.blocksize = sb_min_blocksize(s, opt.blocksize);

	sbi->s_high_sierra = 0; /* default is iso9660 */

	vol_desc_start = (opt.sbsector != -1) ?
		opt.sbsector : isofs_get_last_session(s,opt.session);

	for (iso_blknum = vol_desc_start+16;
		iso_blknum < vol_desc_start+100; iso_blknum++) {
		struct hs_volume_descriptor *hdp;
		struct iso_volume_descriptor  *vdp;

		block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
		if (!(bh = sb_bread(s, block)))
			goto out_no_read;

		vdp = (struct iso_volume_descriptor *)bh->b_data;
		hdp = (struct hs_volume_descriptor *)bh->b_data;

		/*
		 * Due to the overlapping physical location of the descriptors,
		 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
		 * proper identification in this case, we first check for ISO.
		 */
		if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
			if (isonum_711(vdp->type) == ISO_VD_END)
				break;
			if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
				if (pri == NULL) {
					pri = (struct iso_primary_descriptor *)vdp;
					/* Save the buffer in case we need it ... */
					pri_bh = bh;
					bh = NULL;
				}
			}
#ifdef CONFIG_JOLIET
			else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
				sec = (struct iso_supplementary_descriptor *)vdp;
				if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
					if (opt.joliet) {
						if (sec->escape[2] == 0x40)
							joliet_level = 1;
						else if (sec->escape[2] == 0x43)
							joliet_level = 2;
						else if (sec->escape[2] == 0x45)
							joliet_level = 3;

						printk(KERN_DEBUG "ISO 9660 Extensions: "
							"Microsoft Joliet Level %d\n",
							joliet_level);
					}
					goto root_found;
				} else {
				/* Unknown supplementary volume descriptor */
				sec = NULL;
				}
			}
#endif
		} else {
			if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
				if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
					goto out_freebh;

				sbi->s_high_sierra = 1;
				opt.rock = 0;
				h_pri = (struct hs_primary_descriptor *)vdp;
				goto root_found;
			}
		}

		/* Just skip any volume descriptors we don't recognize */

		brelse(bh);
		bh = NULL;
	}
	/*
	 * If we fall through, either no volume descriptor was found,
	 * or else we passed a primary descriptor looking for others.
	 */
	if (!pri)
		goto out_unknown_format;
	brelse(bh);
	bh = pri_bh;
	pri_bh = NULL;

root_found:

	if (joliet_level && (pri == NULL || !opt.rock)) {
		/* This is the case of Joliet with the norock mount flag.
		 * A disc with both Joliet and Rock Ridge is handled later
		 */
		pri = (struct iso_primary_descriptor *) sec;
	}

	if(sbi->s_high_sierra){
		rootp = (struct iso_directory_record *) h_pri->root_directory_record;
		sbi->s_nzones = isonum_733(h_pri->volume_space_size);
		sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
		sbi->s_max_size = isonum_733(h_pri->volume_space_size);
	} else {
		if (!pri)
			goto out_freebh;
		rootp = (struct iso_directory_record *) pri->root_directory_record;
		sbi->s_nzones = isonum_733(pri->volume_space_size);
		sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
		sbi->s_max_size = isonum_733(pri->volume_space_size);
	}

	sbi->s_ninodes = 0; /* No way to figure this out easily */

	orig_zonesize = sbi->s_log_zone_size;
	/*
	 * If the zone size is smaller than the hardware sector size,
	 * this is a fatal error.  This would occur if the disc drive
	 * had sectors that were 2048 bytes, but the filesystem had
	 * blocks that were 512 bytes (which should only very rarely
	 * happen.)
	 */
	if (orig_zonesize < opt.blocksize)
		goto out_bad_size;

	/* RDE: convert log zone size to bit shift */
	switch (sbi->s_log_zone_size) {
	case  512: sbi->s_log_zone_size =  9; break;
	case 1024: sbi->s_log_zone_size = 10; break;
	case 2048: sbi->s_log_zone_size = 11; break;

	default:
		goto out_bad_zone_size;
	}

	s->s_magic = ISOFS_SUPER_MAGIC;

	/*
	 * With multi-extent files, file size is only limited by the maximum
	 * size of a file system, which is 8 TB.
	 */
	s->s_maxbytes = 0x80000000000LL;

	/*
	 * The CDROM is read-only, has no nodes (devices) on it, and since
	 * all of the files appear to be owned by root, we really do not want
	 * to allow suid.  (suid or devices will not show up unless we have
	 * Rock Ridge extensions)
	 */

	s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;

	/* Set this for reference. Its not currently used except on write
	   which we don't have .. */

	first_data_zone = isonum_733(rootp->extent) +
			  isonum_711(rootp->ext_attr_length);
	sbi->s_firstdatazone = first_data_zone;
#ifndef BEQUIET
	printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
		sbi->s_max_size, 1UL << sbi->s_log_zone_size);
	printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
	if(sbi->s_high_sierra)
		printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
#endif

	/*
	 * If the Joliet level is set, we _may_ decide to use the
	 * secondary descriptor, but can't be sure until after we
	 * read the root inode. But before reading the root inode
	 * we may need to change the device blocksize, and would
	 * rather release the old buffer first. So, we cache the
	 * first_data_zone value from the secondary descriptor.
	 */
	if (joliet_level) {
		pri = (struct iso_primary_descriptor *) sec;
		rootp = (struct iso_directory_record *)
			pri->root_directory_record;
		first_data_zone = isonum_733(rootp->extent) +
				isonum_711(rootp->ext_attr_length);
	}

	/*
	 * We're all done using the volume descriptor, and may need
	 * to change the device blocksize, so release the buffer now.
	 */
	brelse(pri_bh);
	brelse(bh);

	/*
	 * Force the blocksize to 512 for 512 byte sectors.  The file
	 * read primitives really get it wrong in a bad way if we don't
	 * do this.
	 *
	 * Note - we should never be setting the blocksize to something
	 * less than the hardware sector size for the device.  If we
	 * do, we would end up having to read larger buffers and split
	 * out portions to satisfy requests.
	 *
	 * Note2- the idea here is that we want to deal with the optimal
	 * zonesize in the filesystem.  If we have it set to something less,
	 * then we have horrible problems with trying to piece together
	 * bits of adjacent blocks in order to properly read directory
	 * entries.  By forcing the blocksize in this way, we ensure
	 * that we will never be required to do this.
	 */
	sb_set_blocksize(s, orig_zonesize);

	sbi->s_nls_iocharset = NULL;

#ifdef CONFIG_JOLIET
	if (joliet_level && opt.utf8 == 0) {
		char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
		sbi->s_nls_iocharset = load_nls(p);
		if (! sbi->s_nls_iocharset) {
			/* Fail only if explicit charset specified */
			if (opt.iocharset)
				goto out_freesbi;
			sbi->s_nls_iocharset = load_nls_default();
		}
	}
#endif
	s->s_op = &isofs_sops;
	s->s_export_op = &isofs_export_ops;
	sbi->s_mapping = opt.map;
	sbi->s_rock = (opt.rock ? 2 : 0);
	sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
	sbi->s_cruft = opt.cruft;
	sbi->s_hide = opt.hide;
	sbi->s_showassoc = opt.showassoc;
	sbi->s_uid = opt.uid;
	sbi->s_gid = opt.gid;
	sbi->s_uid_set = opt.uid_set;
	sbi->s_gid_set = opt.gid_set;
	sbi->s_utf8 = opt.utf8;
	sbi->s_nocompress = opt.nocompress;
	sbi->s_overriderockperm = opt.overriderockperm;
	mutex_init(&sbi->s_mutex);
	/*
	 * It would be incredibly stupid to allow people to mark every file
	 * on the disk as suid, so we merely allow them to set the default
	 * permissions.
	 */
	if (opt.fmode != ISOFS_INVALID_MODE)
		sbi->s_fmode = opt.fmode & 0777;
	else
		sbi->s_fmode = ISOFS_INVALID_MODE;
	if (opt.dmode != ISOFS_INVALID_MODE)
		sbi->s_dmode = opt.dmode & 0777;
	else
		sbi->s_dmode = ISOFS_INVALID_MODE;

	/*
	 * Read the root inode, which _may_ result in changing
	 * the s_rock flag. Once we have the final s_rock value,
	 * we then decide whether to use the Joliet descriptor.
	 */
	inode = isofs_iget(s, sbi->s_firstdatazone, 0);
	if (IS_ERR(inode))
		goto out_no_root;

	/*
	 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
	 * correct Joliet root directory.
	 */
	if (sbi->s_rock == 1 && joliet_level &&
				rootdir_empty(s, sbi->s_firstdatazone)) {
		printk(KERN_NOTICE
			"ISOFS: primary root directory is empty. "
			"Disabling Rock Ridge and switching to Joliet.");
		sbi->s_rock = 0;
	}

	/*
	 * If this disk has both Rock Ridge and Joliet on it, then we
	 * want to use Rock Ridge by default.  This can be overridden
	 * by using the norock mount option.  There is still one other
	 * possibility that is not taken into account: a Rock Ridge
	 * CD with Unicode names.  Until someone sees such a beast, it
	 * will not be supported.
	 */
	if (sbi->s_rock == 1) {
		joliet_level = 0;
	} else if (joliet_level) {
		sbi->s_rock = 0;
		if (sbi->s_firstdatazone != first_data_zone) {
			sbi->s_firstdatazone = first_data_zone;
			printk(KERN_DEBUG
				"ISOFS: changing to secondary root\n");
			iput(inode);
			inode = isofs_iget(s, sbi->s_firstdatazone, 0);
			if (IS_ERR(inode))
				goto out_no_root;
		}
	}

	if (opt.check == 'u') {
		/* Only Joliet is case insensitive by default */
		if (joliet_level)
			opt.check = 'r';
		else
			opt.check = 's';
	}
	sbi->s_joliet_level = joliet_level;

	/* Make sure the root inode is a directory */
	if (!S_ISDIR(inode->i_mode)) {
		printk(KERN_WARNING
			"isofs_fill_super: root inode is not a directory. "
			"Corrupted media?\n");
		goto out_iput;
	}

	/* get the root dentry */
	s->s_root = d_alloc_root(inode);
	if (!(s->s_root))
		goto out_no_root;

	table = 0;
	if (joliet_level)
		table += 2;
	if (opt.check == 'r')
		table++;
	s->s_root->d_op = &isofs_dentry_ops[table];

	kfree(opt.iocharset);

	return 0;

	/*
	 * Display error messages and free resources.
	 */
out_iput:
	iput(inode);
	goto out_no_inode;
out_no_root:
	error = PTR_ERR(inode);
	if (error != -ENOMEM)
		printk(KERN_WARNING "%s: get root inode failed\n", __func__);
out_no_inode:
#ifdef CONFIG_JOLIET
	unload_nls(sbi->s_nls_iocharset);
#endif
	goto out_freesbi;
out_no_read:
	printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
		__func__, s->s_id, iso_blknum, block);
	goto out_freesbi;
out_bad_zone_size:
	printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
		sbi->s_log_zone_size);
	goto out_freebh;
out_bad_size:
	printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
		orig_zonesize, opt.blocksize);
	goto out_freebh;
out_unknown_format:
	if (!silent)
		printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");

out_freebh:
	brelse(bh);
out_freesbi:
	kfree(opt.iocharset);
	kfree(sbi);
	s->s_fs_info = NULL;
	return error;
}

static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

	buf->f_type = ISOFS_SUPER_MAGIC;
	buf->f_bsize = sb->s_blocksize;
	buf->f_blocks = (ISOFS_SB(sb)->s_nzones
		<< (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
	buf->f_bfree = 0;
	buf->f_bavail = 0;
	buf->f_files = ISOFS_SB(sb)->s_ninodes;
	buf->f_ffree = 0;
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);
	buf->f_namelen = NAME_MAX;
	return 0;
}

/*
 * Get a set of blocks; filling in buffer_heads if already allocated
 * or getblk() if they are not.  Returns the number of blocks inserted
 * (-ve == error.)
 */
int isofs_get_blocks(struct inode *inode, sector_t iblock,
		     struct buffer_head **bh, unsigned long nblocks)
{
	unsigned long b_off = iblock;
	unsigned offset, sect_size;
	unsigned int firstext;
	unsigned long nextblk, nextoff;
	int section, rv, error;
	struct iso_inode_info *ei = ISOFS_I(inode);

	error = -EIO;
	rv = 0;
	if (iblock != b_off) {
		printk(KERN_DEBUG "%s: block number too large\n", __func__);
		goto abort;
	}


	offset = 0;
	firstext = ei->i_first_extent;
	sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
	nextblk = ei->i_next_section_block;
	nextoff = ei->i_next_section_offset;
	section = 0;

	while (nblocks) {
		/* If we are *way* beyond the end of the file, print a message.
		 * Access beyond the end of the file up to the next page boundary
		 * is normal, however because of the way the page cache works.
		 * In this case, we just return 0 so that we can properly fill
		 * the page with useless information without generating any
		 * I/O errors.
		 */
		if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
			printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
				__func__, b_off,
				(unsigned long long)inode->i_size);
			goto abort;
		}

		/* On the last section, nextblk == 0, section size is likely to
		 * exceed sect_size by a partial block, and access beyond the
		 * end of the file will reach beyond the section size, too.
		 */
		while (nextblk && (b_off >= (offset + sect_size))) {
			struct inode *ninode;

			offset += sect_size;
			ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
			if (IS_ERR(ninode)) {
				error = PTR_ERR(ninode);
				goto abort;
			}
			firstext  = ISOFS_I(ninode)->i_first_extent;
			sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
			nextblk   = ISOFS_I(ninode)->i_next_section_block;
			nextoff   = ISOFS_I(ninode)->i_next_section_offset;
			iput(ninode);

			if (++section > 100) {
				printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
					" aborting...\n", __func__);
				printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
					"nextblk=%lu nextoff=%lu\n", __func__,
					b_off, firstext, (unsigned) sect_size,
					nextblk, nextoff);
				goto abort;
			}
		}

		if (*bh) {
			map_bh(*bh, inode->i_sb, firstext + b_off - offset);
		} else {
			*bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
			if (!*bh)
				goto abort;
		}
		bh++;	/* Next buffer head */
		b_off++;	/* Next buffer offset */
		nblocks--;
		rv++;
	}

	error = 0;
abort:
	return rv != 0 ? rv : error;
}

/*
 * Used by the standard interfaces.
 */
static int isofs_get_block(struct inode *inode, sector_t iblock,
		    struct buffer_head *bh_result, int create)
{
	int ret;

	if (create) {
		printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
		return -EROFS;
	}

	ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
	return ret < 0 ? ret : 0;
}

static int isofs_bmap(struct inode *inode, sector_t block)
{
	struct buffer_head dummy;
	int error;

	dummy.b_state = 0;
	dummy.b_blocknr = -1000;
	error = isofs_get_block(inode, block, &dummy, 0);
	if (!error)
		return dummy.b_blocknr;
	return 0;
}

struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
{
	sector_t blknr = isofs_bmap(inode, block);
	if (!blknr)
		return NULL;
	return sb_bread(inode->i_sb, blknr);
}

static int isofs_readpage(struct file *file, struct page *page)
{
	return block_read_full_page(page,isofs_get_block);
}

static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping,block,isofs_get_block);
}

static const struct address_space_operations isofs_aops = {
	.readpage = isofs_readpage,
	.sync_page = block_sync_page,
	.bmap = _isofs_bmap
};

static int isofs_read_level3_size(struct inode *inode)
{
	unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
	int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
	struct buffer_head *bh = NULL;
	unsigned long block, offset, block_saved, offset_saved;
	int i = 0;
	int more_entries = 0;
	struct iso_directory_record *tmpde = NULL;
	struct iso_inode_info *ei = ISOFS_I(inode);

	inode->i_size = 0;

	/* The first 16 blocks are reserved as the System Area.  Thus,
	 * no inodes can appear in block 0.  We use this to flag that
	 * this is the last section. */
	ei->i_next_section_block = 0;
	ei->i_next_section_offset = 0;

	block = ei->i_iget5_block;
	offset = ei->i_iget5_offset;

	do {
		struct iso_directory_record *de;
		unsigned int de_len;

		if (!bh) {
			bh = sb_bread(inode->i_sb, block);
			if (!bh)
				goto out_noread;
		}
		de = (struct iso_directory_record *) (bh->b_data + offset);
		de_len = *(unsigned char *) de;

		if (de_len == 0) {
			brelse(bh);
			bh = NULL;
			++block;
			offset = 0;
			continue;
		}

		block_saved = block;
		offset_saved = offset;
		offset += de_len;

		/* Make sure we have a full directory entry */
		if (offset >= bufsize) {
			int slop = bufsize - offset + de_len;
			if (!tmpde) {
				tmpde = kmalloc(256, GFP_KERNEL);
				if (!tmpde)
					goto out_nomem;
			}
			memcpy(tmpde, de, slop);
			offset &= bufsize - 1;
			block++;
			brelse(bh);
			bh = NULL;
			if (offset) {
				bh = sb_bread(inode->i_sb, block);
				if (!bh)
					goto out_noread;
				memcpy((void *)tmpde+slop, bh->b_data, offset);
			}
			de = tmpde;
		}

		inode->i_size += isonum_733(de->size);
		if (i == 1) {
			ei->i_next_section_block = block_saved;
			ei->i_next_section_offset = offset_saved;
		}

		more_entries = de->flags[-high_sierra] & 0x80;

		i++;
		if (i > 100)
			goto out_toomany;
	} while (more_entries);
out:
	kfree(tmpde);
	if (bh)
		brelse(bh);
	return 0;

out_nomem:
	if (bh)
		brelse(bh);
	return -ENOMEM;

out_noread:
	printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
	kfree(tmpde);
	return -EIO;

out_toomany:
	printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
		"isofs_read_level3_size: inode=%lu\n",
		__func__, inode->i_ino);
	goto out;
}

static int isofs_read_inode(struct inode *inode)
{
	struct super_block *sb = inode->i_sb;
	struct isofs_sb_info *sbi = ISOFS_SB(sb);
	unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
	unsigned long block;
	int high_sierra = sbi->s_high_sierra;
	struct buffer_head *bh = NULL;
	struct iso_directory_record *de;
	struct iso_directory_record *tmpde = NULL;
	unsigned int de_len;
	unsigned long offset;
	struct iso_inode_info *ei = ISOFS_I(inode);
	int ret = -EIO;

	block = ei->i_iget5_block;
	bh = sb_bread(inode->i_sb, block);
	if (!bh)
		goto out_badread;

	offset = ei->i_iget5_offset;

	de = (struct iso_directory_record *) (bh->b_data + offset);
	de_len = *(unsigned char *) de;

	if (offset + de_len > bufsize) {
		int frag1 = bufsize - offset;

		tmpde = kmalloc(de_len, GFP_KERNEL);
		if (tmpde == NULL) {
			printk(KERN_INFO "%s: out of memory\n", __func__);
			ret = -ENOMEM;
			goto fail;
		}
		memcpy(tmpde, bh->b_data + offset, frag1);
		brelse(bh);
		bh = sb_bread(inode->i_sb, ++block);
		if (!bh)
			goto out_badread;
		memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
		de = tmpde;
	}

	inode->i_ino = isofs_get_ino(ei->i_iget5_block,
					ei->i_iget5_offset,
					ISOFS_BUFFER_BITS(inode));

	/* Assume it is a normal-format file unless told otherwise */
	ei->i_file_format = isofs_file_normal;

	if (de->flags[-high_sierra] & 2) {
		if (sbi->s_dmode != ISOFS_INVALID_MODE)
			inode->i_mode = S_IFDIR | sbi->s_dmode;
		else
			inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
		inode->i_nlink = 1;	/*
					 * Set to 1.  We know there are 2, but
					 * the find utility tries to optimize
					 * if it is 2, and it screws up.  It is
					 * easier to give 1 which tells find to
					 * do it the hard way.
					 */
	} else {
		if (sbi->s_fmode != ISOFS_INVALID_MODE) {
			inode->i_mode = S_IFREG | sbi->s_fmode;
		} else {
			/*
			 * Set default permissions: r-x for all.  The disc
			 * could be shared with DOS machines so virtually
			 * anything could be a valid executable.
			 */
			inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
		}
		inode->i_nlink = 1;
	}
	inode->i_uid = sbi->s_uid;
	inode->i_gid = sbi->s_gid;
	inode->i_blocks = 0;

	ei->i_format_parm[0] = 0;
	ei->i_format_parm[1] = 0;
	ei->i_format_parm[2] = 0;

	ei->i_section_size = isonum_733(de->size);
	if (de->flags[-high_sierra] & 0x80) {
		ret = isofs_read_level3_size(inode);
		if (ret < 0)
			goto fail;
		ret = -EIO;
	} else {
		ei->i_next_section_block = 0;
		ei->i_next_section_offset = 0;
		inode->i_size = isonum_733(de->size);
	}

	/*
	 * Some dipshit decided to store some other bit of information
	 * in the high byte of the file length.  Truncate size in case
	 * this CDROM was mounted with the cruft option.
	 */

	if (sbi->s_cruft)
		inode->i_size &= 0x00ffffff;

	if (de->interleave[0]) {
		printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
		inode->i_size = 0;
	}

	/* I have no idea what file_unit_size is used for, so
	   we will flag it for now */
	if (de->file_unit_size[0] != 0) {
		printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
			inode->i_ino);
	}

	/* I have no idea what other flag bits are used for, so
	   we will flag it for now */
#ifdef DEBUG
	if((de->flags[-high_sierra] & ~2)!= 0){
		printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
				"(%ld %x).\n",
			inode->i_ino, de->flags[-high_sierra]);
	}
#endif

	inode->i_mtime.tv_sec =
	inode->i_atime.tv_sec =
	inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
	inode->i_mtime.tv_nsec =
	inode->i_atime.tv_nsec =
	inode->i_ctime.tv_nsec = 0;

	ei->i_first_extent = (isonum_733(de->extent) +
			isonum_711(de->ext_attr_length));

	/* Set the number of blocks for stat() - should be done before RR */
	inode->i_blocks = (inode->i_size + 511) >> 9;

	/*
	 * Now test for possible Rock Ridge extensions which will override
	 * some of these numbers in the inode structure.
	 */

	if (!high_sierra) {
		parse_rock_ridge_inode(de, inode);
		/* if we want uid/gid set, override the rock ridge setting */
		if (sbi->s_uid_set)
			inode->i_uid = sbi->s_uid;
		if (sbi->s_gid_set)
			inode->i_gid = sbi->s_gid;
	}
	/* Now set final access rights if overriding rock ridge setting */
	if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
	    sbi->s_dmode != ISOFS_INVALID_MODE)
		inode->i_mode = S_IFDIR | sbi->s_dmode;
	if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
	    sbi->s_fmode != ISOFS_INVALID_MODE)
		inode->i_mode = S_IFREG | sbi->s_fmode;

	/* Install the inode operations vector */
	if (S_ISREG(inode->i_mode)) {
		inode->i_fop = &generic_ro_fops;
		switch (ei->i_file_format) {
#ifdef CONFIG_ZISOFS
		case isofs_file_compressed:
			inode->i_data.a_ops = &zisofs_aops;
			break;
#endif
		default:
			inode->i_data.a_ops = &isofs_aops;
			break;
		}
	} else if (S_ISDIR(inode->i_mode)) {
		inode->i_op = &isofs_dir_inode_operations;
		inode->i_fop = &isofs_dir_operations;
	} else if (S_ISLNK(inode->i_mode)) {
		inode->i_op = &page_symlink_inode_operations;
		inode->i_data.a_ops = &isofs_symlink_aops;
	} else
		/* XXX - parse_rock_ridge_inode() had already set i_rdev. */
		init_special_inode(inode, inode->i_mode, inode->i_rdev);

	ret = 0;
out:
	kfree(tmpde);
	if (bh)
		brelse(bh);
	return ret;

out_badread:
	printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
fail:
	goto out;
}

struct isofs_iget5_callback_data {
	unsigned long block;
	unsigned long offset;
};

static int isofs_iget5_test(struct inode *ino, void *data)
{
	struct iso_inode_info *i = ISOFS_I(ino);
	struct isofs_iget5_callback_data *d =
		(struct isofs_iget5_callback_data*)data;
	return (i->i_iget5_block == d->block)
		&& (i->i_iget5_offset == d->offset);
}

static int isofs_iget5_set(struct inode *ino, void *data)
{
	struct iso_inode_info *i = ISOFS_I(ino);
	struct isofs_iget5_callback_data *d =
		(struct isofs_iget5_callback_data*)data;
	i->i_iget5_block = d->block;
	i->i_iget5_offset = d->offset;
	return 0;
}

/* Store, in the inode's containing structure, the block and block
 * offset that point to the underlying meta-data for the inode.  The
 * code below is otherwise similar to the iget() code in
 * include/linux/fs.h */
struct inode *isofs_iget(struct super_block *sb,
			 unsigned long block,
			 unsigned long offset)
{
	unsigned long hashval;
	struct inode *inode;
	struct isofs_iget5_callback_data data;
	long ret;

	if (offset >= 1ul << sb->s_blocksize_bits)
		return ERR_PTR(-EINVAL);

	data.block = block;
	data.offset = offset;

	hashval = (block << sb->s_blocksize_bits) | offset;

	inode = iget5_locked(sb, hashval, &isofs_iget5_test,
				&isofs_iget5_set, &data);

	if (!inode)
		return ERR_PTR(-ENOMEM);

	if (inode->i_state & I_NEW) {
		ret = isofs_read_inode(inode);
		if (ret < 0) {
			iget_failed(inode);
			inode = ERR_PTR(ret);
		} else {
			unlock_new_inode(inode);
		}
	}

	return inode;
}

static struct dentry *isofs_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
}

static struct file_system_type iso9660_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "iso9660",
	.mount		= isofs_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static int __init init_iso9660_fs(void)
{
	int err = init_inodecache();
	if (err)
		goto out;
#ifdef CONFIG_ZISOFS
	err = zisofs_init();
	if (err)
		goto out1;
#endif
	err = register_filesystem(&iso9660_fs_type);
	if (err)
		goto out2;
	return 0;
out2:
#ifdef CONFIG_ZISOFS
	zisofs_cleanup();
out1:
#endif
	destroy_inodecache();
out:
	return err;
}

static void __exit exit_iso9660_fs(void)
{
        unregister_filesystem(&iso9660_fs_type);
#ifdef CONFIG_ZISOFS
	zisofs_cleanup();
#endif
	destroy_inodecache();
}

module_init(init_iso9660_fs)
module_exit(exit_iso9660_fs)
MODULE_LICENSE("GPL");
/* Actual filesystem name is iso9660, as requested in filesystems.c */
MODULE_ALIAS("iso9660");
OpenPOWER on IntegriCloud