forked from dorimanx/exfat-nofuse
-
Notifications
You must be signed in to change notification settings - Fork 0
/
exfat.c
5252 lines (4272 loc) · 133 KB
/
exfat.c
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
/************************************************************************/
/* */
/* PROJECT : exFAT & FAT12/16/32 File System */
/* FILE : exfat.c */
/* PURPOSE : exFAT File Manager */
/* */
/*----------------------------------------------------------------------*/
/* NOTES */
/* */
/*----------------------------------------------------------------------*/
/* REVISION HISTORY (Ver 0.9) */
/* */
/* - 2010.11.15 [Joosun Hahn] : first writing */
/* */
/************************************************************************/
#include <linux/version.h>
#include "exfat_config.h"
#include "exfat_global.h"
#include "exfat_data.h"
#include "exfat_oal.h"
#include "exfat_blkdev.h"
#include "exfat_cache.h"
#include "exfat_nls.h"
#include "exfat_api.h"
#include "exfat_super.h"
#include "exfat.h"
#include <linux/blkdev.h>
/*----------------------------------------------------------------------*/
/* Constant & Macro Definitions */
/*----------------------------------------------------------------------*/
#define THERE_IS_MBR 0 /* if there is no MBR (e.g. memory card),
set this macro to 0 */
#if (THERE_IS_MBR == 1)
#include "exfat_part.h"
#endif
#define DELAYED_SYNC 0
#define ELAPSED_TIME 0
#if (ELAPSED_TIME == 1)
#include <linux/time.h>
static UINT32 __t1, __t2;
static UINT32 get_current_msec(void)
{
struct timeval tm;
do_gettimeofday(&tm);
return (UINT32)(tm.tv_sec*1000000 + tm.tv_usec);
}
#define TIME_START() do {__t1 = get_current_msec(); } while (0)
#define TIME_END() do {__t2 = get_current_msec(); } while (0)
#define PRINT_TIME(n) do {printk("[EXFAT] Elapsed time %d = %d (usec)\n", n, (__t2 - __t1)); } while (0)
#else
#define TIME_START()
#define TIME_END()
#define PRINT_TIME(n)
#endif
/*----------------------------------------------------------------------*/
/* Global Variable Definitions */
/*----------------------------------------------------------------------*/
extern UINT8 uni_upcase[];
/*----------------------------------------------------------------------*/
/* Local Variable Definitions */
/*----------------------------------------------------------------------*/
static UINT8 name_buf[MAX_PATH_LENGTH *MAX_CHARSET_SIZE];
static INT8 *reserved_names[] = {
"AUX ", "CON ", "NUL ", "PRN ",
"COM1 ", "COM2 ", "COM3 ", "COM4 ",
"COM5 ", "COM6 ", "COM7 ", "COM8 ", "COM9 ",
"LPT1 ", "LPT2 ", "LPT3 ", "LPT4 ",
"LPT5 ", "LPT6 ", "LPT7 ", "LPT8 ", "LPT9 ",
NULL
};
static UINT8 free_bit[] = {
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, /* 0 ~ 19 */
0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, /* 20 ~ 39 */
0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /* 40 ~ 59 */
0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, /* 60 ~ 79 */
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, /* 80 ~ 99 */
0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, /* 100 ~ 119 */
0, 1, 0, 2, 0, 1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /* 120 ~ 139 */
0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, /* 140 ~ 159 */
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, /* 160 ~ 179 */
0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, /* 180 ~ 199 */
0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /* 200 ~ 219 */
0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, /* 220 ~ 239 */
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 /* 240 ~ 254 */
};
static UINT8 used_bit[] = {
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, /* 0 ~ 19 */
2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, /* 20 ~ 39 */
2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, /* 40 ~ 59 */
4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, /* 60 ~ 79 */
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, /* 80 ~ 99 */
3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, /* 100 ~ 119 */
4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, /* 120 ~ 139 */
3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, /* 140 ~ 159 */
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, /* 160 ~ 179 */
4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, /* 180 ~ 199 */
3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, /* 200 ~ 219 */
5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, /* 220 ~ 239 */
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8 /* 240 ~ 255 */
};
/*======================================================================*/
/* Global Function Definitions */
/*======================================================================*/
/* ffsInit : roll back to the initial state of the file system */
INT32 ffsInit(void)
{
INT32 ret;
ret = bdev_init();
if (ret)
return ret;
ret = fs_init();
if (ret)
return ret;
/*
ret = buf_init();
if (ret)
return ret;
*/
return FFS_SUCCESS;
} /* end of ffsInit */
/* ffsShutdown : make free all memory-alloced global buffers */
INT32 ffsShutdown(void)
{
INT32 ret;
/*
ret = buf_shutdown();
if (ret)
return ret;
*/
ret = fs_shutdown();
if (ret)
return ret;
ret = bdev_shutdown();
if (ret)
return ret;
return FFS_SUCCESS;
} /* end of ffsShutdown */
/* ffsMountVol : mount the file system volume */
INT32 ffsMountVol(struct super_block *sb, INT32 drv)
{
INT32 i, ret;
#if (THERE_IS_MBR == 1)
MBR_SECTOR_T *p_mbr;
PART_ENTRY_T *p_pte;
#endif
PBR_SECTOR_T *p_pbr;
struct buffer_head *tmp_bh = NULL;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
printk("[EXFAT] ===== ffsMountVol =====\n");
p_fs->drv = drv;
p_fs->dev_ejected = FALSE;
/* open the block device */
if (bdev_open(sb))
return FFS_MEDIAERR;
if (p_bd->sector_size < sb->s_blocksize)
return FFS_MEDIAERR;
if (p_bd->sector_size > sb->s_blocksize)
sb_set_blocksize(sb, p_bd->sector_size);
/* read Sector 0 */
if (sector_read(sb, 0, &tmp_bh, 1) != FFS_SUCCESS)
return FFS_MEDIAERR;
#if (THERE_IS_MBR == 1)
if (buf[0] != 0xEB) {
/* MBR is read */
p_mbr = (MBR_SECTOR_T *) tmp_bh->b_data;
/* check the validity of MBR */
if (GET16_A(p_mbr->signature) != MBR_SIGNATURE) {
brelse(tmp_bh);
bdev_close(sb);
return FFS_FORMATERR;
}
p_pte = (PART_ENTRY_T *) p_mbr->partition + 0;
p_fs->PBR_sector = GET32(p_pte->start_sector);
p_fs->num_sectors = GET32(p_pte->num_sectors);
if (p_fs->num_sectors == 0) {
brelse(tmp_bh);
bdev_close(sb);
return FFS_ERROR;
}
/* read PBR */
if (sector_read(sb, p_fs->PBR_sector, &tmp_bh, 1) != FFS_SUCCESS) {
bdev_close(sb);
return FFS_MEDIAERR;
}
} else {
#endif
/* PRB is read */
p_fs->PBR_sector = 0;
#if (THERE_IS_MBR == 1)
}
#endif
p_pbr = (PBR_SECTOR_T *) tmp_bh->b_data;
/* check the validity of PBR */
if (GET16_A(p_pbr->signature) != PBR_SIGNATURE) {
brelse(tmp_bh);
bdev_close(sb);
return FFS_FORMATERR;
}
/* fill fs_stuct */
for (i = 0; i < 53; i++)
if (p_pbr->bpb[i])
break;
if (i < 53) {
if (GET16(p_pbr->bpb+11)) /* num_fat_sectors */
ret = fat16_mount(sb, p_pbr);
else
ret = fat32_mount(sb, p_pbr);
} else {
ret = exfat_mount(sb, p_pbr);
}
brelse(tmp_bh);
if (ret) {
bdev_close(sb);
return ret;
}
if (p_fs->vol_type == EXFAT) {
ret = load_alloc_bitmap(sb);
if (ret) {
bdev_close(sb);
return ret;
}
ret = load_upcase_table(sb);
if (ret) {
free_alloc_bitmap(sb);
bdev_close(sb);
return ret;
}
}
if (p_fs->dev_ejected) {
if (p_fs->vol_type == EXFAT) {
free_upcase_table(sb);
free_alloc_bitmap(sb);
}
bdev_close(sb);
return FFS_MEDIAERR;
}
return FFS_SUCCESS;
} /* end of ffsMountVol */
/* ffsUmountVol : umount the file system volume */
INT32 ffsUmountVol(struct super_block *sb)
{
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
if (p_fs->vol_type == EXFAT) {
free_upcase_table(sb);
free_alloc_bitmap(sb);
}
FAT_release_all(sb);
buf_release_all(sb);
/* close the block device */
bdev_close(sb);
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
} /* end of ffsUmountVol */
/* ffsGetVolInfo : get the information of a file system volume */
INT32 ffsGetVolInfo(struct super_block *sb, VOL_INFO_T *info)
{
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
if (p_fs->used_clusters == (UINT32) ~0)
p_fs->used_clusters = p_fs->fs_func->count_used_clusters(sb);
info->FatType = p_fs->vol_type;
info->ClusterSize = p_fs->cluster_size;
info->NumClusters = p_fs->num_clusters - 2; /* clu 0 & 1 */
info->UsedClusters = p_fs->used_clusters;
info->FreeClusters = info->NumClusters - info->UsedClusters;
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
} /* end of ffsGetVolInfo */
/* ffsSyncVol : synchronize all file system volumes */
INT32 ffsSyncVol(struct super_block *sb, INT32 do_sync)
{
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
/* synchronize the file system */
fs_sync(sb, do_sync);
fs_set_vol_flags(sb, VOL_CLEAN);
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
} /* end of ffsSyncVol */
/*----------------------------------------------------------------------*/
/* File Operation Functions */
/*----------------------------------------------------------------------*/
/* ffsLookupFile : lookup a file */
INT32 ffsLookupFile(struct inode *inode, UINT8 *path, FILE_ID_T *fid)
{
INT32 ret, dentry, num_entries;
CHAIN_T dir;
UNI_NAME_T uni_name;
DOS_NAME_T dos_name;
DENTRY_T *ep, *ep2;
ENTRY_SET_CACHE_T *es=NULL;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
PRINTK("ffsLookupFile entered\n");
/* check the validity of directory name in the given pathname */
ret = resolve_path(inode, path, &dir, &uni_name);
if (ret)
return ret;
ret = get_num_entries_and_dos_name(sb, &dir, &uni_name, &num_entries, &dos_name);
if (ret)
return ret;
/* search the file name for directories */
dentry = p_fs->fs_func->find_dir_entry(sb, &dir, &uni_name, num_entries, &dos_name, TYPE_ALL);
if (dentry < -1)
return FFS_NOTFOUND;
fid->dir.dir = dir.dir;
fid->dir.size = dir.size;
fid->dir.flags = dir.flags;
fid->entry = dentry;
if (dentry == -1) {
fid->type = TYPE_DIR;
fid->rwoffset = 0;
fid->hint_last_off = -1;
fid->attr = ATTR_SUBDIR;
fid->flags = 0x01;
fid->size = 0;
fid->start_clu = p_fs->root_dir;
} else {
if (p_fs->vol_type == EXFAT) {
es = get_entry_set_in_dir(sb, &dir, dentry, ES_2_ENTRIES, &ep);
if (!es)
return FFS_MEDIAERR;
ep2 = ep+1;
} else {
ep = get_entry_in_dir(sb, &dir, dentry, NULL);
if (!ep)
return FFS_MEDIAERR;
ep2 = ep;
}
fid->type = p_fs->fs_func->get_entry_type(ep);
fid->rwoffset = 0;
fid->hint_last_off = -1;
fid->attr = p_fs->fs_func->get_entry_attr(ep);
fid->size = p_fs->fs_func->get_entry_size(ep2);
if ((fid->type == TYPE_FILE) && (fid->size == 0)) {
fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
fid->start_clu = CLUSTER_32(~0);
} else {
fid->flags = p_fs->fs_func->get_entry_flag(ep2);
fid->start_clu = p_fs->fs_func->get_entry_clu0(ep2);
}
if (p_fs->vol_type == EXFAT)
release_entry_set(es);
}
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
PRINTK("ffsLookupFile exited successfully\n");
return FFS_SUCCESS;
} /* end of ffsLookupFile */
/* ffsCreateFile : create a file */
INT32 ffsCreateFile(struct inode *inode, UINT8 *path, UINT8 mode, FILE_ID_T *fid)
{
INT32 ret/*, dentry*/;
CHAIN_T dir;
UNI_NAME_T uni_name;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
/* check the validity of directory name in the given pathname */
ret = resolve_path(inode, path, &dir, &uni_name);
if (ret)
return ret;
fs_set_vol_flags(sb, VOL_DIRTY);
/* create a new file */
ret = create_file(inode, &dir, &uni_name, mode, fid);
#if (DELAYED_SYNC == 0)
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return ret;
} /* end of ffsCreateFile */
/* ffsReadFile : read data from a opened file */
INT32 ffsReadFile(struct inode *inode, FILE_ID_T *fid, void *buffer, UINT64 count, UINT64 *rcount)
{
INT32 offset, sec_offset, clu_offset;
UINT32 clu, LogSector;
UINT64 oneblkread, read_bytes;
struct buffer_head *tmp_bh = NULL;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
/* check if the given file ID is opened */
if (fid->type != TYPE_FILE)
return FFS_PERMISSIONERR;
if (fid->rwoffset > fid->size)
fid->rwoffset = fid->size;
if (count > (fid->size - fid->rwoffset))
count = fid->size - fid->rwoffset;
if (count == 0) {
if (rcount != NULL)
*rcount = 0;
return FFS_EOF;
}
read_bytes = 0;
while (count > 0) {
clu_offset = (INT32)(fid->rwoffset >> p_fs->cluster_size_bits);
clu = fid->start_clu;
if (fid->flags == 0x03) {
clu += clu_offset;
} else {
/* hint information */
if ((clu_offset > 0) && (fid->hint_last_off > 0) &&
(clu_offset >= fid->hint_last_off)) {
clu_offset -= fid->hint_last_off;
clu = fid->hint_last_clu;
}
while (clu_offset > 0) {
/* clu = FAT_read(sb, clu); */
if (FAT_read(sb, clu, &clu) == -1)
return FFS_MEDIAERR;
clu_offset--;
}
}
/* hint information */
fid->hint_last_off = (INT32)(fid->rwoffset >> p_fs->cluster_size_bits);
fid->hint_last_clu = clu;
offset = (INT32)(fid->rwoffset & (p_fs->cluster_size-1)); /* byte offset in cluster */
sec_offset = offset >> p_bd->sector_size_bits; /* sector offset in cluster */
offset &= p_bd->sector_size_mask; /* byte offset in sector */
LogSector = START_SECTOR(clu) + sec_offset;
oneblkread = (UINT64)(p_bd->sector_size - offset);
if (oneblkread > count)
oneblkread = count;
if ((offset == 0) && (oneblkread == p_bd->sector_size)) {
if (sector_read(sb, LogSector, &tmp_bh, 1) != FFS_SUCCESS)
goto err_out;
MEMCPY(((INT8 *) buffer)+read_bytes, ((INT8 *) tmp_bh->b_data), (INT32) oneblkread);
} else {
if (sector_read(sb, LogSector, &tmp_bh, 1) != FFS_SUCCESS)
goto err_out;
MEMCPY(((INT8 *) buffer)+read_bytes, ((INT8 *) tmp_bh->b_data)+offset, (INT32) oneblkread);
}
count -= oneblkread;
read_bytes += oneblkread;
fid->rwoffset += oneblkread;
}
brelse(tmp_bh);
err_out:
/* set the size of read bytes */
if (rcount != NULL)
*rcount = read_bytes;
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
} /* end of ffsReadFile */
/* ffsWriteFile : write data into a opened file */
INT32 ffsWriteFile(struct inode *inode, FILE_ID_T *fid, void *buffer, UINT64 count, UINT64 *wcount)
{
INT32 modified = FALSE, offset, sec_offset, clu_offset;
INT32 num_clusters, num_alloc, num_alloced = (INT32) ~0;
UINT32 clu, last_clu, LogSector, sector = 0;
UINT64 oneblkwrite, write_bytes;
CHAIN_T new_clu;
TIMESTAMP_T tm;
DENTRY_T *ep, *ep2;
ENTRY_SET_CACHE_T *es = NULL;
struct buffer_head *tmp_bh = NULL;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
/* check if the given file ID is opened */
if (fid->type != TYPE_FILE)
return FFS_PERMISSIONERR;
if (fid->rwoffset > fid->size)
fid->rwoffset = fid->size;
if (count == 0) {
if (wcount != NULL)
*wcount = 0;
return FFS_SUCCESS;
}
fs_set_vol_flags(sb, VOL_DIRTY);
if (fid->size == 0)
num_clusters = 0;
else
num_clusters = (INT32)((fid->size-1) >> p_fs->cluster_size_bits) + 1;
write_bytes = 0;
while (count > 0) {
clu_offset = (INT32)(fid->rwoffset >> p_fs->cluster_size_bits);
clu = last_clu = fid->start_clu;
if (fid->flags == 0x03) {
if ((clu_offset > 0) && (clu != CLUSTER_32(~0))) {
last_clu += clu_offset - 1;
if (clu_offset == num_clusters)
clu = CLUSTER_32(~0);
else
clu += clu_offset;
}
} else {
/* hint information */
if ((clu_offset > 0) && (fid->hint_last_off > 0) &&
(clu_offset >= fid->hint_last_off)) {
clu_offset -= fid->hint_last_off;
clu = fid->hint_last_clu;
}
while ((clu_offset > 0) && (clu != CLUSTER_32(~0))) {
last_clu = clu;
/* clu = FAT_read(sb, clu); */
if (FAT_read(sb, clu, &clu) == -1)
return FFS_MEDIAERR;
clu_offset--;
}
}
if (clu == CLUSTER_32(~0)) {
num_alloc = (INT32)((count-1) >> p_fs->cluster_size_bits) + 1;
new_clu.dir = (last_clu == CLUSTER_32(~0)) ? CLUSTER_32(~0) : last_clu+1;
new_clu.size = 0;
new_clu.flags = fid->flags;
/* (1) allocate a chain of clusters */
num_alloced = p_fs->fs_func->alloc_cluster(sb, num_alloc, &new_clu);
if (num_alloced == 0)
break;
/* (2) append to the FAT chain */
if (last_clu == CLUSTER_32(~0)) {
if (new_clu.flags == 0x01)
fid->flags = 0x01;
fid->start_clu = new_clu.dir;
modified = TRUE;
} else {
if (new_clu.flags != fid->flags) {
exfat_chain_cont_cluster(sb, fid->start_clu, num_clusters);
fid->flags = 0x01;
modified = TRUE;
}
if (new_clu.flags == 0x01)
FAT_write(sb, last_clu, new_clu.dir);
}
num_clusters += num_alloced;
clu = new_clu.dir;
}
/* hint information */
fid->hint_last_off = (INT32)(fid->rwoffset >> p_fs->cluster_size_bits);
fid->hint_last_clu = clu;
offset = (INT32)(fid->rwoffset & (p_fs->cluster_size-1)); /* byte offset in cluster */
sec_offset = offset >> p_bd->sector_size_bits; /* sector offset in cluster */
offset &= p_bd->sector_size_mask; /* byte offset in sector */
LogSector = START_SECTOR(clu) + sec_offset;
oneblkwrite = (UINT64)(p_bd->sector_size - offset);
if (oneblkwrite > count)
oneblkwrite = count;
if ((offset == 0) && (oneblkwrite == p_bd->sector_size)) {
if (sector_read(sb, LogSector, &tmp_bh, 0) != FFS_SUCCESS)
goto err_out;
MEMCPY(((INT8 *) tmp_bh->b_data), ((INT8 *) buffer)+write_bytes, (INT32) oneblkwrite);
if (sector_write(sb, LogSector, tmp_bh, 0) != FFS_SUCCESS) {
brelse(tmp_bh);
goto err_out;
}
} else {
if ((offset > 0) || ((fid->rwoffset+oneblkwrite) < fid->size)) {
if (sector_read(sb, LogSector, &tmp_bh, 1) != FFS_SUCCESS)
goto err_out;
} else {
if (sector_read(sb, LogSector, &tmp_bh, 0) != FFS_SUCCESS)
goto err_out;
}
MEMCPY(((INT8 *) tmp_bh->b_data)+offset, ((INT8 *) buffer)+write_bytes, (INT32) oneblkwrite);
if (sector_write(sb, LogSector, tmp_bh, 0) != FFS_SUCCESS) {
brelse(tmp_bh);
goto err_out;
}
}
count -= oneblkwrite;
write_bytes += oneblkwrite;
fid->rwoffset += oneblkwrite;
fid->attr |= ATTR_ARCHIVE;
if (fid->size < fid->rwoffset) {
fid->size = fid->rwoffset;
modified = TRUE;
}
}
brelse(tmp_bh);
/* (3) update the direcoty entry */
if (p_fs->vol_type == EXFAT) {
es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry, ES_ALL_ENTRIES, &ep);
if (es == NULL)
goto err_out;
ep2 = ep+1;
} else {
ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, §or);
if (!ep)
goto err_out;
ep2 = ep;
}
p_fs->fs_func->set_entry_time(ep, tm_current(&tm), TM_MODIFY);
p_fs->fs_func->set_entry_attr(ep, fid->attr);
if (p_fs->vol_type != EXFAT)
buf_modify(sb, sector);
if (modified) {
if (p_fs->fs_func->get_entry_flag(ep2) != fid->flags)
p_fs->fs_func->set_entry_flag(ep2, fid->flags);
if (p_fs->fs_func->get_entry_size(ep2) != fid->size)
p_fs->fs_func->set_entry_size(ep2, fid->size);
if (p_fs->fs_func->get_entry_clu0(ep2) != fid->start_clu)
p_fs->fs_func->set_entry_clu0(ep2, fid->start_clu);
if (p_fs->vol_type != EXFAT)
buf_modify(sb, sector);
}
if (p_fs->vol_type == EXFAT) {
update_dir_checksum_with_entry_set(sb, es);
release_entry_set(es);
}
#if (DELAYED_SYNC == 0)
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
err_out:
/* set the size of written bytes */
if (wcount != NULL)
*wcount = write_bytes;
if (num_alloced == 0)
return FFS_FULL;
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
} /* end of ffsWriteFile */
/* ffsTruncateFile : resize the file length */
INT32 ffsTruncateFile(struct inode *inode, UINT64 new_size)
{
INT32 num_clusters;
UINT32 last_clu = CLUSTER_32(0), sector = 0;
CHAIN_T clu;
TIMESTAMP_T tm;
DENTRY_T *ep, *ep2;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
FILE_ID_T *fid = &(EXFAT_I(inode)->fid);
ENTRY_SET_CACHE_T *es=NULL;
/* check if the given file ID is opened */
if (fid->type != TYPE_FILE)
return FFS_PERMISSIONERR;
if (fid->size <= new_size)
return FFS_SUCCESS;
fs_set_vol_flags(sb, VOL_DIRTY);
clu.dir = fid->start_clu;
clu.size = (INT32)((fid->size-1) >> p_fs->cluster_size_bits) + 1;
clu.flags = fid->flags;
if (new_size > 0) {
num_clusters = (INT32)((new_size-1) >> p_fs->cluster_size_bits) + 1;
if (clu.flags == 0x03) {
clu.dir += num_clusters;
} else {
while (num_clusters > 0) {
last_clu = clu.dir;
/* clu.dir = FAT_read(sb, clu.dir);*/
if (FAT_read(sb, clu.dir, &(clu.dir)) == -1)
return FFS_MEDIAERR;
num_clusters--;
}
}
clu.size -= num_clusters;
}
fid->size = new_size;
fid->attr |= ATTR_ARCHIVE;
if (new_size == 0) {
fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
fid->start_clu = CLUSTER_32(~0);
}
/* (1) update the directory entry */
if (p_fs->vol_type == EXFAT) {
es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry, ES_ALL_ENTRIES, &ep);
if (es == NULL)
return FFS_MEDIAERR;
ep2 = ep+1;
} else {
ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, §or);
if (!ep)
return FFS_MEDIAERR;
ep2 = ep;
}
p_fs->fs_func->set_entry_time(ep, tm_current(&tm), TM_MODIFY);
p_fs->fs_func->set_entry_attr(ep, fid->attr);
/* if (p_fs->vol_type != EXFAT)
buf_modify(sb, sector); */
p_fs->fs_func->set_entry_size(ep2, new_size);
if (new_size == 0) {
p_fs->fs_func->set_entry_flag(ep2, 0x01);
p_fs->fs_func->set_entry_clu0(ep2, CLUSTER_32(0));
}
if (p_fs->vol_type != EXFAT)
buf_modify(sb, sector);
else {
update_dir_checksum_with_entry_set(sb, es);
release_entry_set(es);
}
/* (2) cut off from the FAT chain */
if (last_clu != CLUSTER_32(0)) {
if (fid->flags == 0x01)
FAT_write(sb, last_clu, CLUSTER_32(~0));
}
/* (3) free the clusters */
p_fs->fs_func->free_cluster(sb, &clu, 0);
/* hint information */
fid->hint_last_off = -1;
if (fid->rwoffset > fid->size) {
fid->rwoffset = fid->size;
}
#if (DELAYED_SYNC == 0)
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
} /* end of ffsTruncateFile */
/* ffsMoveFile : move(rename) a old file into a new file */
INT32 ffsMoveFile(struct inode *old_parent_inode, FILE_ID_T *fid, struct inode *new_parent_inode, struct dentry *new_dentry)
{
INT32 ret;
INT32 dentry;
CHAIN_T olddir, newdir;
CHAIN_T *p_dir=NULL;
UNI_NAME_T uni_name;
DENTRY_T *ep;
struct super_block *sb = old_parent_inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
UINT8 *new_path = (UINT8 *) new_dentry->d_name.name;
struct inode *new_inode = new_dentry->d_inode;
int num_entries;
FILE_ID_T *new_fid = NULL;
INT32 new_entry=0;
/* check the validity of pointer parameters */
if ((new_path == NULL) || (STRLEN(new_path) == 0))
return FFS_ERROR;
olddir.dir = fid->dir.dir;
olddir.size = fid->dir.size;
olddir.flags = fid->dir.flags;
dentry = fid->entry;
/* check if the old file is "." or ".." */
if (p_fs->vol_type != EXFAT) {
if ((olddir.dir != p_fs->root_dir) && (dentry < 2))
return FFS_PERMISSIONERR;
}
ep = get_entry_in_dir(sb, &olddir, dentry, NULL);
if (!ep)
return FFS_MEDIAERR;
if (p_fs->fs_func->get_entry_attr(ep) & ATTR_READONLY)
return FFS_PERMISSIONERR;
/* check whether new dir is existing directory and empty */
if (new_inode) {
UINT32 entry_type;
ret = FFS_MEDIAERR;
new_fid = &EXFAT_I(new_inode)->fid;
p_dir = &(new_fid->dir);
new_entry = new_fid->entry;
ep = get_entry_in_dir(sb, p_dir, new_entry, NULL);
if (!ep)
goto out;
entry_type = p_fs->fs_func->get_entry_type(ep);
if (entry_type == TYPE_DIR) {
CHAIN_T new_clu;
new_clu.dir = new_fid->start_clu;
new_clu.size = (INT32)((new_fid->size-1) >> p_fs->cluster_size_bits) + 1;
new_clu.flags = new_fid->flags;
if (!is_dir_empty(sb, &new_clu))
return FFS_FILEEXIST;
}
}
/* check the validity of directory name in the given new pathname */
ret = resolve_path(new_parent_inode, new_path, &newdir, &uni_name);
if (ret)
return ret;
fs_set_vol_flags(sb, VOL_DIRTY);
if (olddir.dir == newdir.dir)
ret = rename_file(new_parent_inode, &olddir, dentry, &uni_name, fid);
else
ret = move_file(new_parent_inode, &olddir, dentry, &newdir, &uni_name, fid);
if ((ret == FFS_SUCCESS) && new_inode) {
/* delete entries of new_dir */
ep = get_entry_in_dir(sb, p_dir, new_entry, NULL);
if (!ep)
goto out;
num_entries = p_fs->fs_func->count_ext_entries(sb, p_dir, new_entry, ep);
if (num_entries < 0)
goto out;
p_fs->fs_func->delete_dir_entry(sb, p_dir, new_entry, 0, num_entries+1);
}
out:
#if (DELAYED_SYNC == 0)
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return ret;
} /* end of ffsMoveFile */
/* ffsRemoveFile : remove a file */
INT32 ffsRemoveFile(struct inode *inode, FILE_ID_T *fid)
{
INT32 dentry;
CHAIN_T dir, clu_to_free;
DENTRY_T *ep;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
dir.dir = fid->dir.dir;
dir.size = fid->dir.size;
dir.flags = fid->dir.flags;
dentry = fid->entry;
ep = get_entry_in_dir(sb, &dir, dentry, NULL);
if (!ep)
return FFS_MEDIAERR;
if (p_fs->fs_func->get_entry_attr(ep) & ATTR_READONLY)
return FFS_PERMISSIONERR;
fs_set_vol_flags(sb, VOL_DIRTY);
/* (1) update the directory entry */
remove_file(inode, &dir, dentry);