-
Notifications
You must be signed in to change notification settings - Fork 0
/
file.c
1281 lines (1059 loc) · 28.4 KB
/
file.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
// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
*
* Regular file handling primitives for NTFS-based filesystems.
*
*/
#include <linux/backing-dev.h>
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/compat.h>
#include <linux/falloc.h>
#include <linux/fiemap.h>
#include "debug.h"
#include "ntfs.h"
#include "ntfs_fs.h"
static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
{
struct fstrim_range __user *user_range;
struct fstrim_range range;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!bdev_max_discard_sectors(sbi->sb->s_bdev))
return -EOPNOTSUPP;
user_range = (struct fstrim_range __user *)arg;
if (copy_from_user(&range, user_range, sizeof(range)))
return -EFAULT;
range.minlen = max_t(u32, range.minlen,
bdev_discard_granularity(sbi->sb->s_bdev));
err = ntfs_trim_fs(sbi, &range);
if (err < 0)
return err;
if (copy_to_user(user_range, &range, sizeof(range)))
return -EFAULT;
return 0;
}
static long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
switch (cmd) {
case FITRIM:
return ntfs_ioctl_fitrim(sbi, arg);
}
return -ENOTTY; /* Inappropriate ioctl for device. */
}
#ifdef CONFIG_COMPAT
static long ntfs_compat_ioctl(struct file *filp, u32 cmd, unsigned long arg)
{
return ntfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
}
#endif
/*
* ntfs_getattr - inode_operations::getattr
*/
int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
struct kstat *stat, u32 request_mask, u32 flags)
{
struct inode *inode = d_inode(path->dentry);
struct ntfs_inode *ni = ntfs_i(inode);
if (is_compressed(ni))
stat->attributes |= STATX_ATTR_COMPRESSED;
if (is_encrypted(ni))
stat->attributes |= STATX_ATTR_ENCRYPTED;
stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED;
generic_fillattr(mnt_userns, inode, stat);
stat->result_mask |= STATX_BTIME;
stat->btime = ni->i_crtime;
stat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */
return 0;
}
static int ntfs_extend_initialized_size(struct file *file,
struct ntfs_inode *ni,
const loff_t valid,
const loff_t new_valid)
{
struct inode *inode = &ni->vfs_inode;
struct address_space *mapping = inode->i_mapping;
struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
loff_t pos = valid;
int err;
if (is_resident(ni)) {
ni->i_valid = new_valid;
return 0;
}
WARN_ON(is_compressed(ni));
WARN_ON(valid >= new_valid);
for (;;) {
u32 zerofrom, len;
struct page *page;
u8 bits;
CLST vcn, lcn, clen;
if (is_sparsed(ni)) {
bits = sbi->cluster_bits;
vcn = pos >> bits;
err = attr_data_get_block(ni, vcn, 0, &lcn, &clen,
NULL);
if (err)
goto out;
if (lcn == SPARSE_LCN) {
loff_t vbo = (loff_t)vcn << bits;
loff_t to = vbo + ((loff_t)clen << bits);
if (to <= new_valid) {
ni->i_valid = to;
pos = to;
goto next;
}
if (vbo < pos) {
pos = vbo;
} else {
to = (new_valid >> bits) << bits;
if (pos < to) {
ni->i_valid = to;
pos = to;
goto next;
}
}
}
}
zerofrom = pos & (PAGE_SIZE - 1);
len = PAGE_SIZE - zerofrom;
if (pos + len > new_valid)
len = new_valid - pos;
err = ntfs_write_begin(file, mapping, pos, len, &page, NULL);
if (err)
goto out;
zero_user_segment(page, zerofrom, PAGE_SIZE);
/* This function in any case puts page. */
err = ntfs_write_end(file, mapping, pos, len, len, page, NULL);
if (err < 0)
goto out;
pos += len;
next:
if (pos >= new_valid)
break;
balance_dirty_pages_ratelimited(mapping);
cond_resched();
}
return 0;
out:
ni->i_valid = valid;
ntfs_inode_warn(inode, "failed to extend initialized size to %llx.",
new_valid);
return err;
}
/*
* ntfs_zero_range - Helper function for punch_hole.
*
* It zeroes a range [vbo, vbo_to).
*/
static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
{
int err = 0;
struct address_space *mapping = inode->i_mapping;
u32 blocksize = 1 << inode->i_blkbits;
pgoff_t idx = vbo >> PAGE_SHIFT;
u32 z_start = vbo & (PAGE_SIZE - 1);
pgoff_t idx_end = (vbo_to + PAGE_SIZE - 1) >> PAGE_SHIFT;
loff_t page_off;
struct buffer_head *head, *bh;
u32 bh_next, bh_off, z_end;
sector_t iblock;
struct page *page;
for (; idx < idx_end; idx += 1, z_start = 0) {
page_off = (loff_t)idx << PAGE_SHIFT;
z_end = (page_off + PAGE_SIZE) > vbo_to ? (vbo_to - page_off)
: PAGE_SIZE;
iblock = page_off >> inode->i_blkbits;
page = find_or_create_page(mapping, idx,
mapping_gfp_constraint(mapping,
~__GFP_FS));
if (!page)
return -ENOMEM;
if (!page_has_buffers(page))
create_empty_buffers(page, blocksize, 0);
bh = head = page_buffers(page);
bh_off = 0;
do {
bh_next = bh_off + blocksize;
if (bh_next <= z_start || bh_off >= z_end)
continue;
if (!buffer_mapped(bh)) {
ntfs_get_block(inode, iblock, bh, 0);
/* Unmapped? It's a hole - nothing to do. */
if (!buffer_mapped(bh))
continue;
}
/* Ok, it's mapped. Make sure it's up-to-date. */
if (PageUptodate(page))
set_buffer_uptodate(bh);
if (!buffer_uptodate(bh)) {
lock_buffer(bh);
bh->b_end_io = end_buffer_read_sync;
get_bh(bh);
submit_bh(REQ_OP_READ, bh);
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
unlock_page(page);
put_page(page);
err = -EIO;
goto out;
}
}
mark_buffer_dirty(bh);
} while (bh_off = bh_next, iblock += 1,
head != (bh = bh->b_this_page));
zero_user_segment(page, z_start, z_end);
unlock_page(page);
put_page(page);
cond_resched();
}
out:
mark_inode_dirty(inode);
return err;
}
/*
* ntfs_sparse_cluster - Helper function to zero a new allocated clusters.
*
* NOTE: 512 <= cluster size <= 2M
*/
void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn,
CLST len)
{
struct address_space *mapping = inode->i_mapping;
struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
u64 vbo = (u64)vcn << sbi->cluster_bits;
u64 bytes = (u64)len << sbi->cluster_bits;
u32 blocksize = 1 << inode->i_blkbits;
pgoff_t idx0 = page0 ? page0->index : -1;
loff_t vbo_clst = vbo & sbi->cluster_mask_inv;
loff_t end = ntfs_up_cluster(sbi, vbo + bytes);
pgoff_t idx = vbo_clst >> PAGE_SHIFT;
u32 from = vbo_clst & (PAGE_SIZE - 1);
pgoff_t idx_end = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
loff_t page_off;
u32 to;
bool partial;
struct page *page;
for (; idx < idx_end; idx += 1, from = 0) {
page = idx == idx0 ? page0 : grab_cache_page(mapping, idx);
if (!page)
continue;
page_off = (loff_t)idx << PAGE_SHIFT;
to = (page_off + PAGE_SIZE) > end ? (end - page_off)
: PAGE_SIZE;
partial = false;
if ((from || PAGE_SIZE != to) &&
likely(!page_has_buffers(page))) {
create_empty_buffers(page, blocksize, 0);
}
if (page_has_buffers(page)) {
struct buffer_head *head, *bh;
u32 bh_off = 0;
bh = head = page_buffers(page);
do {
u32 bh_next = bh_off + blocksize;
if (from <= bh_off && bh_next <= to) {
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
} else if (!buffer_uptodate(bh)) {
partial = true;
}
bh_off = bh_next;
} while (head != (bh = bh->b_this_page));
}
zero_user_segment(page, from, to);
if (!partial) {
if (!PageUptodate(page))
SetPageUptodate(page);
set_page_dirty(page);
}
if (idx != idx0) {
unlock_page(page);
put_page(page);
}
cond_resched();
}
mark_inode_dirty(inode);
}
/*
* ntfs_file_mmap - file_operations::mmap
*/
static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
u64 from = ((u64)vma->vm_pgoff << PAGE_SHIFT);
bool rw = vma->vm_flags & VM_WRITE;
int err;
if (is_encrypted(ni)) {
ntfs_inode_warn(inode, "mmap encrypted not supported");
return -EOPNOTSUPP;
}
if (is_dedup(ni)) {
ntfs_inode_warn(inode, "mmap deduplicated not supported");
return -EOPNOTSUPP;
}
if (is_compressed(ni) && rw) {
ntfs_inode_warn(inode, "mmap(write) compressed not supported");
return -EOPNOTSUPP;
}
if (rw) {
u64 to = min_t(loff_t, i_size_read(inode),
from + vma->vm_end - vma->vm_start);
if (is_sparsed(ni)) {
/* Allocate clusters for rw map. */
struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info;
CLST lcn, len;
CLST vcn = from >> sbi->cluster_bits;
CLST end = bytes_to_cluster(sbi, to);
bool new;
for (; vcn < end; vcn += len) {
err = attr_data_get_block(ni, vcn, 1, &lcn,
&len, &new);
if (err)
goto out;
if (!new)
continue;
ntfs_sparse_cluster(inode, NULL, vcn, 1);
}
}
if (ni->i_valid < to) {
if (!inode_trylock(inode)) {
err = -EAGAIN;
goto out;
}
err = ntfs_extend_initialized_size(file, ni,
ni->i_valid, to);
inode_unlock(inode);
if (err)
goto out;
}
}
err = generic_file_mmap(file, vma);
out:
return err;
}
static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
struct file *file)
{
struct ntfs_inode *ni = ntfs_i(inode);
struct address_space *mapping = inode->i_mapping;
loff_t end = pos + count;
bool extend_init = file && pos > ni->i_valid;
int err;
if (end <= inode->i_size && !extend_init)
return 0;
/* Mark rw ntfs as dirty. It will be cleared at umount. */
ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY);
if (end > inode->i_size) {
err = ntfs_set_size(inode, end);
if (err)
goto out;
inode->i_size = end;
}
if (extend_init && !is_compressed(ni)) {
err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
if (err)
goto out;
} else {
err = 0;
}
inode->i_ctime = inode->i_mtime = current_time(inode);
mark_inode_dirty(inode);
if (IS_SYNC(inode)) {
int err2;
err = filemap_fdatawrite_range(mapping, pos, end - 1);
err2 = sync_mapping_buffers(mapping);
if (!err)
err = err2;
err2 = write_inode_now(inode, 1);
if (!err)
err = err2;
if (!err)
err = filemap_fdatawait_range(mapping, pos, end - 1);
}
out:
return err;
}
static int ntfs_truncate(struct inode *inode, loff_t new_size)
{
struct super_block *sb = inode->i_sb;
struct ntfs_inode *ni = ntfs_i(inode);
int err, dirty = 0;
u64 new_valid;
if (!S_ISREG(inode->i_mode))
return 0;
if (is_compressed(ni)) {
if (ni->i_valid > new_size)
ni->i_valid = new_size;
} else {
err = block_truncate_page(inode->i_mapping, new_size,
ntfs_get_block);
if (err)
return err;
}
new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size));
truncate_setsize(inode, new_size);
ni_lock(ni);
down_write(&ni->file.run_lock);
err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size,
&new_valid, ni->mi.sbi->options->prealloc, NULL);
up_write(&ni->file.run_lock);
if (new_valid < ni->i_valid)
ni->i_valid = new_valid;
ni_unlock(ni);
ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE;
inode->i_ctime = inode->i_mtime = current_time(inode);
if (!IS_DIRSYNC(inode)) {
dirty = 1;
} else {
err = ntfs_sync_inode(inode);
if (err)
return err;
}
if (dirty)
mark_inode_dirty(inode);
/*ntfs_flush_inodes(inode->i_sb, inode, NULL);*/
return 0;
}
/*
* ntfs_fallocate
*
* Preallocate space for a file. This implements ntfs's fallocate file
* operation, which gets called from sys_fallocate system call. User
* space requests 'len' bytes at 'vbo'. If FALLOC_FL_KEEP_SIZE is set
* we just allocate clusters without zeroing them out. Otherwise we
* allocate and zero out clusters via an expanding truncate.
*/
static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
{
struct inode *inode = file->f_mapping->host;
struct address_space *mapping = inode->i_mapping;
struct super_block *sb = inode->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct ntfs_inode *ni = ntfs_i(inode);
loff_t end = vbo + len;
loff_t vbo_down = round_down(vbo, PAGE_SIZE);
bool is_supported_holes = is_sparsed(ni) || is_compressed(ni);
loff_t i_size, new_size;
bool map_locked;
int err;
/* No support for dir. */
if (!S_ISREG(inode->i_mode))
return -EOPNOTSUPP;
/*
* vfs_fallocate checks all possible combinations of mode.
* Do additional checks here before ntfs_set_state(dirty).
*/
if (mode & FALLOC_FL_PUNCH_HOLE) {
if (!is_supported_holes)
return -EOPNOTSUPP;
} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
} else if (mode & FALLOC_FL_INSERT_RANGE) {
if (!is_supported_holes)
return -EOPNOTSUPP;
} else if (mode &
~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)) {
ntfs_inode_warn(inode, "fallocate(0x%x) is not supported",
mode);
return -EOPNOTSUPP;
}
ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);
inode_lock(inode);
i_size = inode->i_size;
new_size = max(end, i_size);
map_locked = false;
if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
/* Should never be here, see ntfs_file_open. */
err = -EOPNOTSUPP;
goto out;
}
if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE |
FALLOC_FL_INSERT_RANGE)) {
inode_dio_wait(inode);
filemap_invalidate_lock(mapping);
map_locked = true;
}
if (mode & FALLOC_FL_PUNCH_HOLE) {
u32 frame_size;
loff_t mask, vbo_a, end_a, tmp;
err = filemap_write_and_wait_range(mapping, vbo, end - 1);
if (err)
goto out;
err = filemap_write_and_wait_range(mapping, end, LLONG_MAX);
if (err)
goto out;
truncate_pagecache(inode, vbo_down);
ni_lock(ni);
err = attr_punch_hole(ni, vbo, len, &frame_size);
ni_unlock(ni);
if (err != E_NTFS_NOTALIGNED)
goto out;
/* Process not aligned punch. */
mask = frame_size - 1;
vbo_a = (vbo + mask) & ~mask;
end_a = end & ~mask;
tmp = min(vbo_a, end);
if (tmp > vbo) {
err = ntfs_zero_range(inode, vbo, tmp);
if (err)
goto out;
}
if (vbo < end_a && end_a < end) {
err = ntfs_zero_range(inode, end_a, end);
if (err)
goto out;
}
/* Aligned punch_hole */
if (end_a > vbo_a) {
ni_lock(ni);
err = attr_punch_hole(ni, vbo_a, end_a - vbo_a, NULL);
ni_unlock(ni);
}
} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
/*
* Write tail of the last page before removed range since
* it will get removed from the page cache below.
*/
err = filemap_write_and_wait_range(mapping, vbo_down, vbo);
if (err)
goto out;
/*
* Write data that will be shifted to preserve them
* when discarding page cache below.
*/
err = filemap_write_and_wait_range(mapping, end, LLONG_MAX);
if (err)
goto out;
truncate_pagecache(inode, vbo_down);
ni_lock(ni);
err = attr_collapse_range(ni, vbo, len);
ni_unlock(ni);
} else if (mode & FALLOC_FL_INSERT_RANGE) {
/* Check new size. */
err = inode_newsize_ok(inode, new_size);
if (err)
goto out;
/* Write out all dirty pages. */
err = filemap_write_and_wait_range(mapping, vbo_down,
LLONG_MAX);
if (err)
goto out;
truncate_pagecache(inode, vbo_down);
ni_lock(ni);
err = attr_insert_range(ni, vbo, len);
ni_unlock(ni);
} else {
/* Check new size. */
/* generic/213: expected -ENOSPC instead of -EFBIG. */
if (!is_supported_holes) {
loff_t to_alloc = new_size - inode_get_bytes(inode);
if (to_alloc > 0 &&
(to_alloc >> sbi->cluster_bits) >
wnd_zeroes(&sbi->used.bitmap)) {
err = -ENOSPC;
goto out;
}
}
err = inode_newsize_ok(inode, new_size);
if (err)
goto out;
/*
* Allocate clusters, do not change 'valid' size.
*/
err = ntfs_set_size(inode, new_size);
if (err)
goto out;
if (is_supported_holes) {
CLST vcn_v = ni->i_valid >> sbi->cluster_bits;
CLST vcn = vbo >> sbi->cluster_bits;
CLST cend = bytes_to_cluster(sbi, end);
CLST lcn, clen;
bool new;
/*
* Allocate but do not zero new clusters. (see below comments)
* This breaks security: One can read unused on-disk areas.
* Zeroing these clusters may be too long.
* Maybe we should check here for root rights?
*/
for (; vcn < cend; vcn += clen) {
err = attr_data_get_block(ni, vcn, cend - vcn,
&lcn, &clen, &new);
if (err)
goto out;
if (!new || vcn >= vcn_v)
continue;
/*
* Unwritten area.
* NTFS is not able to store several unwritten areas.
* Activate 'ntfs_sparse_cluster' to zero new allocated clusters.
*
* Dangerous in case:
* 1G of sparsed clusters + 1 cluster of data =>
* valid_size == 1G + 1 cluster
* fallocate(1G) will zero 1G and this can be very long
* xfstest 016/086 will fail without 'ntfs_sparse_cluster'.
*/
ntfs_sparse_cluster(inode, NULL, vcn,
min(vcn_v - vcn, clen));
}
}
if (mode & FALLOC_FL_KEEP_SIZE) {
ni_lock(ni);
/* True - Keep preallocated. */
err = attr_set_size(ni, ATTR_DATA, NULL, 0,
&ni->file.run, i_size, &ni->i_valid,
true, NULL);
ni_unlock(ni);
}
}
out:
if (map_locked)
filemap_invalidate_unlock(mapping);
if (!err) {
inode->i_ctime = inode->i_mtime = current_time(inode);
mark_inode_dirty(inode);
}
inode_unlock(inode);
return err;
}
/*
* ntfs3_setattr - inode_operations::setattr
*/
int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
struct iattr *attr)
{
struct super_block *sb = dentry->d_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
struct inode *inode = d_inode(dentry);
struct ntfs_inode *ni = ntfs_i(inode);
u32 ia_valid = attr->ia_valid;
umode_t mode = inode->i_mode;
int err;
if (sbi->options->noacsrules) {
/* "No access rules" - Force any changes of time etc. */
attr->ia_valid |= ATTR_FORCE;
/* and disable for editing some attributes. */
attr->ia_valid &= ~(ATTR_UID | ATTR_GID | ATTR_MODE);
ia_valid = attr->ia_valid;
}
err = setattr_prepare(mnt_userns, dentry, attr);
if (err)
goto out;
if (ia_valid & ATTR_SIZE) {
loff_t oldsize = inode->i_size;
if (WARN_ON(ni->ni_flags & NI_FLAG_COMPRESSED_MASK)) {
/* Should never be here, see ntfs_file_open(). */
err = -EOPNOTSUPP;
goto out;
}
inode_dio_wait(inode);
if (attr->ia_size <= oldsize)
err = ntfs_truncate(inode, attr->ia_size);
else if (attr->ia_size > oldsize)
err = ntfs_extend(inode, attr->ia_size, 0, NULL);
if (err)
goto out;
ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
}
setattr_copy(mnt_userns, inode, attr);
if (mode != inode->i_mode) {
err = ntfs_acl_chmod(mnt_userns, inode);
if (err)
goto out;
/* Linux 'w' -> Windows 'ro'. */
if (0222 & inode->i_mode)
ni->std_fa &= ~FILE_ATTRIBUTE_READONLY;
else
ni->std_fa |= FILE_ATTRIBUTE_READONLY;
}
if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE))
ntfs_save_wsl_perm(inode);
mark_inode_dirty(inode);
out:
return err;
}
static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
if (is_encrypted(ni)) {
ntfs_inode_warn(inode, "encrypted i/o not supported");
return -EOPNOTSUPP;
}
if (is_compressed(ni) && (iocb->ki_flags & IOCB_DIRECT)) {
ntfs_inode_warn(inode, "direct i/o + compressed not supported");
return -EOPNOTSUPP;
}
#ifndef CONFIG_NTFS3_LZX_XPRESS
if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
ntfs_inode_warn(
inode,
"activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
return -EOPNOTSUPP;
}
#endif
if (is_dedup(ni)) {
ntfs_inode_warn(inode, "read deduplicated not supported");
return -EOPNOTSUPP;
}
return generic_file_read_iter(iocb, iter);
}
/*
* ntfs_get_frame_pages
*
* Return: Array of locked pages.
*/
static int ntfs_get_frame_pages(struct address_space *mapping, pgoff_t index,
struct page **pages, u32 pages_per_frame,
bool *frame_uptodate)
{
gfp_t gfp_mask = mapping_gfp_mask(mapping);
u32 npages;
*frame_uptodate = true;
for (npages = 0; npages < pages_per_frame; npages++, index++) {
struct page *page;
page = find_or_create_page(mapping, index, gfp_mask);
if (!page) {
while (npages--) {
page = pages[npages];
unlock_page(page);
put_page(page);
}
return -ENOMEM;
}
if (!PageUptodate(page))
*frame_uptodate = false;
pages[npages] = page;
}
return 0;
}
/*
* ntfs_compress_write - Helper for ntfs_file_write_iter() (compressed files).
*/
static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
{
int err;
struct file *file = iocb->ki_filp;
size_t count = iov_iter_count(from);
loff_t pos = iocb->ki_pos;
struct inode *inode = file_inode(file);
loff_t i_size = inode->i_size;
struct address_space *mapping = inode->i_mapping;
struct ntfs_inode *ni = ntfs_i(inode);
u64 valid = ni->i_valid;
struct ntfs_sb_info *sbi = ni->mi.sbi;
struct page *page, **pages = NULL;
size_t written = 0;
u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits;
u32 frame_size = 1u << frame_bits;
u32 pages_per_frame = frame_size >> PAGE_SHIFT;
u32 ip, off;
CLST frame;
u64 frame_vbo;
pgoff_t index;
bool frame_uptodate;
if (frame_size < PAGE_SIZE) {
/*
* frame_size == 8K if cluster 512
* frame_size == 64K if cluster 4096
*/
ntfs_inode_warn(inode, "page size is bigger than frame size");
return -EOPNOTSUPP;
}
pages = kmalloc_array(pages_per_frame, sizeof(struct page *), GFP_NOFS);
if (!pages)
return -ENOMEM;
current->backing_dev_info = inode_to_bdi(inode);
err = file_remove_privs(file);
if (err)
goto out;
err = file_update_time(file);
if (err)
goto out;
/* Zero range [valid : pos). */
while (valid < pos) {
CLST lcn, clen;
frame = valid >> frame_bits;
frame_vbo = valid & ~(frame_size - 1);
off = valid & (frame_size - 1);
err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 0, &lcn,
&clen, NULL);
if (err)
goto out;
if (lcn == SPARSE_LCN) {
ni->i_valid = valid =
frame_vbo + ((u64)clen << sbi->cluster_bits);
continue;
}
/* Load full frame. */
err = ntfs_get_frame_pages(mapping, frame_vbo >> PAGE_SHIFT,
pages, pages_per_frame,
&frame_uptodate);
if (err)
goto out;
if (!frame_uptodate && off) {
err = ni_read_frame(ni, frame_vbo, pages,
pages_per_frame);
if (err) {
for (ip = 0; ip < pages_per_frame; ip++) {
page = pages[ip];
unlock_page(page);
put_page(page);
}
goto out;
}
}
ip = off >> PAGE_SHIFT;
off = offset_in_page(valid);
for (; ip < pages_per_frame; ip++, off = 0) {
page = pages[ip];
zero_user_segment(page, off, PAGE_SIZE);
flush_dcache_page(page);
SetPageUptodate(page);
}
ni_lock(ni);
err = ni_write_frame(ni, pages, pages_per_frame);
ni_unlock(ni);
for (ip = 0; ip < pages_per_frame; ip++) {
page = pages[ip];
SetPageUptodate(page);
unlock_page(page);
put_page(page);
}
if (err)