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9#include <linux/errno.h>
10#include <linux/fs.h>
11#include <linux/gfp.h>
12#include <linux/mm.h>
13#include <linux/pagemap.h>
14#include <linux/swap.h>
15#include <linux/buffer_head.h>
16#include <linux/writeback.h>
17#include <linux/bit_spinlock.h>
18#include <linux/bio.h>
19
20#include "aops.h"
21#include "attrib.h"
22#include "debug.h"
23#include "inode.h"
24#include "mft.h"
25#include "runlist.h"
26#include "types.h"
27#include "ntfs.h"
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
46{
47 unsigned long flags;
48 struct buffer_head *first, *tmp;
49 struct page *page;
50 struct inode *vi;
51 ntfs_inode *ni;
52 int page_uptodate = 1;
53
54 page = bh->b_page;
55 vi = page->mapping->host;
56 ni = NTFS_I(vi);
57
58 if (likely(uptodate)) {
59 loff_t i_size;
60 s64 file_ofs, init_size;
61
62 set_buffer_uptodate(bh);
63
64 file_ofs = ((s64)page->index << PAGE_SHIFT) +
65 bh_offset(bh);
66 read_lock_irqsave(&ni->size_lock, flags);
67 init_size = ni->initialized_size;
68 i_size = i_size_read(vi);
69 read_unlock_irqrestore(&ni->size_lock, flags);
70 if (unlikely(init_size > i_size)) {
71
72 init_size = i_size;
73 }
74
75 if (unlikely(file_ofs + bh->b_size > init_size)) {
76 int ofs;
77 void *kaddr;
78
79 ofs = 0;
80 if (file_ofs < init_size)
81 ofs = init_size - file_ofs;
82 kaddr = kmap_atomic(page);
83 memset(kaddr + bh_offset(bh) + ofs, 0,
84 bh->b_size - ofs);
85 flush_dcache_page(page);
86 kunmap_atomic(kaddr);
87 }
88 } else {
89 clear_buffer_uptodate(bh);
90 SetPageError(page);
91 ntfs_error(ni->vol->sb, "Buffer I/O error, logical block "
92 "0x%llx.", (unsigned long long)bh->b_blocknr);
93 }
94 first = page_buffers(page);
95 spin_lock_irqsave(&first->b_uptodate_lock, flags);
96 clear_buffer_async_read(bh);
97 unlock_buffer(bh);
98 tmp = bh;
99 do {
100 if (!buffer_uptodate(tmp))
101 page_uptodate = 0;
102 if (buffer_async_read(tmp)) {
103 if (likely(buffer_locked(tmp)))
104 goto still_busy;
105
106 BUG();
107 }
108 tmp = tmp->b_this_page;
109 } while (tmp != bh);
110 spin_unlock_irqrestore(&first->b_uptodate_lock, flags);
111
112
113
114
115
116
117
118
119 if (!NInoMstProtected(ni)) {
120 if (likely(page_uptodate && !PageError(page)))
121 SetPageUptodate(page);
122 } else {
123 u8 *kaddr;
124 unsigned int i, recs;
125 u32 rec_size;
126
127 rec_size = ni->itype.index.block_size;
128 recs = PAGE_SIZE / rec_size;
129
130 BUG_ON(!recs);
131 kaddr = kmap_atomic(page);
132 for (i = 0; i < recs; i++)
133 post_read_mst_fixup((NTFS_RECORD*)(kaddr +
134 i * rec_size), rec_size);
135 kunmap_atomic(kaddr);
136 flush_dcache_page(page);
137 if (likely(page_uptodate && !PageError(page)))
138 SetPageUptodate(page);
139 }
140 unlock_page(page);
141 return;
142still_busy:
143 spin_unlock_irqrestore(&first->b_uptodate_lock, flags);
144 return;
145}
146
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161
162
163
164static int ntfs_read_block(struct page *page)
165{
166 loff_t i_size;
167 VCN vcn;
168 LCN lcn;
169 s64 init_size;
170 struct inode *vi;
171 ntfs_inode *ni;
172 ntfs_volume *vol;
173 runlist_element *rl;
174 struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE];
175 sector_t iblock, lblock, zblock;
176 unsigned long flags;
177 unsigned int blocksize, vcn_ofs;
178 int i, nr;
179 unsigned char blocksize_bits;
180
181 vi = page->mapping->host;
182 ni = NTFS_I(vi);
183 vol = ni->vol;
184
185
186 BUG_ON(!ni->runlist.rl && !ni->mft_no && !NInoAttr(ni));
187
188 blocksize = vol->sb->s_blocksize;
189 blocksize_bits = vol->sb->s_blocksize_bits;
190
191 if (!page_has_buffers(page)) {
192 create_empty_buffers(page, blocksize, 0);
193 if (unlikely(!page_has_buffers(page))) {
194 unlock_page(page);
195 return -ENOMEM;
196 }
197 }
198 bh = head = page_buffers(page);
199 BUG_ON(!bh);
200
201
202
203
204
205
206
207
208
209
210
211
212 iblock = (s64)page->index << (PAGE_SHIFT - blocksize_bits);
213 read_lock_irqsave(&ni->size_lock, flags);
214 lblock = (ni->allocated_size + blocksize - 1) >> blocksize_bits;
215 init_size = ni->initialized_size;
216 i_size = i_size_read(vi);
217 read_unlock_irqrestore(&ni->size_lock, flags);
218 if (unlikely(init_size > i_size)) {
219
220 init_size = i_size;
221 }
222 zblock = (init_size + blocksize - 1) >> blocksize_bits;
223
224
225 rl = NULL;
226 nr = i = 0;
227 do {
228 int err = 0;
229
230 if (unlikely(buffer_uptodate(bh)))
231 continue;
232 if (unlikely(buffer_mapped(bh))) {
233 arr[nr++] = bh;
234 continue;
235 }
236 bh->b_bdev = vol->sb->s_bdev;
237
238 if (iblock < lblock) {
239 bool is_retry = false;
240
241
242 vcn = (VCN)iblock << blocksize_bits >>
243 vol->cluster_size_bits;
244 vcn_ofs = ((VCN)iblock << blocksize_bits) &
245 vol->cluster_size_mask;
246 if (!rl) {
247lock_retry_remap:
248 down_read(&ni->runlist.lock);
249 rl = ni->runlist.rl;
250 }
251 if (likely(rl != NULL)) {
252
253 while (rl->length && rl[1].vcn <= vcn)
254 rl++;
255 lcn = ntfs_rl_vcn_to_lcn(rl, vcn);
256 } else
257 lcn = LCN_RL_NOT_MAPPED;
258
259 if (lcn >= 0) {
260
261 bh->b_blocknr = ((lcn << vol->cluster_size_bits)
262 + vcn_ofs) >> blocksize_bits;
263 set_buffer_mapped(bh);
264
265 if (iblock < zblock) {
266 arr[nr++] = bh;
267 continue;
268 }
269
270 goto handle_zblock;
271 }
272
273 if (lcn == LCN_HOLE)
274 goto handle_hole;
275
276 if (!is_retry && lcn == LCN_RL_NOT_MAPPED) {
277 is_retry = true;
278
279
280
281
282 up_read(&ni->runlist.lock);
283 err = ntfs_map_runlist(ni, vcn);
284 if (likely(!err))
285 goto lock_retry_remap;
286 rl = NULL;
287 } else if (!rl)
288 up_read(&ni->runlist.lock);
289
290
291
292
293
294 if (err == -ENOENT || lcn == LCN_ENOENT) {
295 err = 0;
296 goto handle_hole;
297 }
298
299 if (!err)
300 err = -EIO;
301 bh->b_blocknr = -1;
302 SetPageError(page);
303 ntfs_error(vol->sb, "Failed to read from inode 0x%lx, "
304 "attribute type 0x%x, vcn 0x%llx, "
305 "offset 0x%x because its location on "
306 "disk could not be determined%s "
307 "(error code %i).", ni->mft_no,
308 ni->type, (unsigned long long)vcn,
309 vcn_ofs, is_retry ? " even after "
310 "retrying" : "", err);
311 }
312
313
314
315
316
317handle_hole:
318 bh->b_blocknr = -1UL;
319 clear_buffer_mapped(bh);
320handle_zblock:
321 zero_user(page, i * blocksize, blocksize);
322 if (likely(!err))
323 set_buffer_uptodate(bh);
324 } while (i++, iblock++, (bh = bh->b_this_page) != head);
325
326
327 if (rl)
328 up_read(&ni->runlist.lock);
329
330
331 if (nr) {
332 struct buffer_head *tbh;
333
334
335 for (i = 0; i < nr; i++) {
336 tbh = arr[i];
337 lock_buffer(tbh);
338 tbh->b_end_io = ntfs_end_buffer_async_read;
339 set_buffer_async_read(tbh);
340 }
341
342 for (i = 0; i < nr; i++) {
343 tbh = arr[i];
344 if (likely(!buffer_uptodate(tbh)))
345 submit_bh(REQ_OP_READ, 0, tbh);
346 else
347 ntfs_end_buffer_async_read(tbh, 1);
348 }
349 return 0;
350 }
351
352 if (likely(!PageError(page)))
353 SetPageUptodate(page);
354 else
355 nr = -EIO;
356 unlock_page(page);
357 return nr;
358}
359
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377
378static int ntfs_readpage(struct file *file, struct page *page)
379{
380 loff_t i_size;
381 struct inode *vi;
382 ntfs_inode *ni, *base_ni;
383 u8 *addr;
384 ntfs_attr_search_ctx *ctx;
385 MFT_RECORD *mrec;
386 unsigned long flags;
387 u32 attr_len;
388 int err = 0;
389
390retry_readpage:
391 BUG_ON(!PageLocked(page));
392 vi = page->mapping->host;
393 i_size = i_size_read(vi);
394
395 if (unlikely(page->index >= (i_size + PAGE_SIZE - 1) >>
396 PAGE_SHIFT)) {
397 zero_user(page, 0, PAGE_SIZE);
398 ntfs_debug("Read outside i_size - truncated?");
399 goto done;
400 }
401
402
403
404
405 if (PageUptodate(page)) {
406 unlock_page(page);
407 return 0;
408 }
409 ni = NTFS_I(vi);
410
411
412
413
414
415
416
417
418 if (ni->type != AT_INDEX_ALLOCATION) {
419
420 if (NInoEncrypted(ni)) {
421 BUG_ON(ni->type != AT_DATA);
422 err = -EACCES;
423 goto err_out;
424 }
425
426 if (NInoNonResident(ni) && NInoCompressed(ni)) {
427 BUG_ON(ni->type != AT_DATA);
428 BUG_ON(ni->name_len);
429 return ntfs_read_compressed_block(page);
430 }
431 }
432
433 if (NInoNonResident(ni)) {
434
435 return ntfs_read_block(page);
436 }
437
438
439
440
441
442
443
444
445 if (unlikely(page->index > 0)) {
446 zero_user(page, 0, PAGE_SIZE);
447 goto done;
448 }
449 if (!NInoAttr(ni))
450 base_ni = ni;
451 else
452 base_ni = ni->ext.base_ntfs_ino;
453
454 mrec = map_mft_record(base_ni);
455 if (IS_ERR(mrec)) {
456 err = PTR_ERR(mrec);
457 goto err_out;
458 }
459
460
461
462
463 if (unlikely(NInoNonResident(ni))) {
464 unmap_mft_record(base_ni);
465 goto retry_readpage;
466 }
467 ctx = ntfs_attr_get_search_ctx(base_ni, mrec);
468 if (unlikely(!ctx)) {
469 err = -ENOMEM;
470 goto unm_err_out;
471 }
472 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
473 CASE_SENSITIVE, 0, NULL, 0, ctx);
474 if (unlikely(err))
475 goto put_unm_err_out;
476 attr_len = le32_to_cpu(ctx->attr->data.resident.value_length);
477 read_lock_irqsave(&ni->size_lock, flags);
478 if (unlikely(attr_len > ni->initialized_size))
479 attr_len = ni->initialized_size;
480 i_size = i_size_read(vi);
481 read_unlock_irqrestore(&ni->size_lock, flags);
482 if (unlikely(attr_len > i_size)) {
483
484 attr_len = i_size;
485 }
486 addr = kmap_atomic(page);
487
488 memcpy(addr, (u8*)ctx->attr +
489 le16_to_cpu(ctx->attr->data.resident.value_offset),
490 attr_len);
491
492 memset(addr + attr_len, 0, PAGE_SIZE - attr_len);
493 flush_dcache_page(page);
494 kunmap_atomic(addr);
495put_unm_err_out:
496 ntfs_attr_put_search_ctx(ctx);
497unm_err_out:
498 unmap_mft_record(base_ni);
499done:
500 SetPageUptodate(page);
501err_out:
502 unlock_page(page);
503 return err;
504}
505
506#ifdef NTFS_RW
507
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530static int ntfs_write_block(struct page *page, struct writeback_control *wbc)
531{
532 VCN vcn;
533 LCN lcn;
534 s64 initialized_size;
535 loff_t i_size;
536 sector_t block, dblock, iblock;
537 struct inode *vi;
538 ntfs_inode *ni;
539 ntfs_volume *vol;
540 runlist_element *rl;
541 struct buffer_head *bh, *head;
542 unsigned long flags;
543 unsigned int blocksize, vcn_ofs;
544 int err;
545 bool need_end_writeback;
546 unsigned char blocksize_bits;
547
548 vi = page->mapping->host;
549 ni = NTFS_I(vi);
550 vol = ni->vol;
551
552 ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, page index "
553 "0x%lx.", ni->mft_no, ni->type, page->index);
554
555 BUG_ON(!NInoNonResident(ni));
556 BUG_ON(NInoMstProtected(ni));
557 blocksize = vol->sb->s_blocksize;
558 blocksize_bits = vol->sb->s_blocksize_bits;
559 if (!page_has_buffers(page)) {
560 BUG_ON(!PageUptodate(page));
561 create_empty_buffers(page, blocksize,
562 (1 << BH_Uptodate) | (1 << BH_Dirty));
563 if (unlikely(!page_has_buffers(page))) {
564 ntfs_warning(vol->sb, "Error allocating page "
565 "buffers. Redirtying page so we try "
566 "again later.");
567
568
569
570
571 redirty_page_for_writepage(wbc, page);
572 unlock_page(page);
573 return 0;
574 }
575 }
576 bh = head = page_buffers(page);
577 BUG_ON(!bh);
578
579
580
581
582 block = (s64)page->index << (PAGE_SHIFT - blocksize_bits);
583
584 read_lock_irqsave(&ni->size_lock, flags);
585 i_size = i_size_read(vi);
586 initialized_size = ni->initialized_size;
587 read_unlock_irqrestore(&ni->size_lock, flags);
588
589
590 dblock = (i_size + blocksize - 1) >> blocksize_bits;
591
592
593 iblock = initialized_size >> blocksize_bits;
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610 rl = NULL;
611 err = 0;
612 do {
613 bool is_retry = false;
614
615 if (unlikely(block >= dblock)) {
616
617
618
619
620
621
622
623
624
625
626
627 clear_buffer_dirty(bh);
628 set_buffer_uptodate(bh);
629 continue;
630 }
631
632
633 if (!buffer_dirty(bh))
634 continue;
635
636
637 if (unlikely((block >= iblock) &&
638 (initialized_size < i_size))) {
639
640
641
642
643
644
645 if (block > iblock) {
646
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657
658
659
660 }
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665
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668
669
670 if (!PageUptodate(page)) {
671
672
673
674 }
675
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678
679
680
681 ntfs_error(vol->sb, "Writing beyond initialized size "
682 "is not supported yet. Sorry.");
683 err = -EOPNOTSUPP;
684 break;
685
686
687
688
689 }
690
691
692 if (buffer_mapped(bh))
693 continue;
694
695
696 bh->b_bdev = vol->sb->s_bdev;
697
698
699 vcn = (VCN)block << blocksize_bits;
700 vcn_ofs = vcn & vol->cluster_size_mask;
701 vcn >>= vol->cluster_size_bits;
702 if (!rl) {
703lock_retry_remap:
704 down_read(&ni->runlist.lock);
705 rl = ni->runlist.rl;
706 }
707 if (likely(rl != NULL)) {
708
709 while (rl->length && rl[1].vcn <= vcn)
710 rl++;
711 lcn = ntfs_rl_vcn_to_lcn(rl, vcn);
712 } else
713 lcn = LCN_RL_NOT_MAPPED;
714
715 if (lcn >= 0) {
716
717 bh->b_blocknr = ((lcn << vol->cluster_size_bits) +
718 vcn_ofs) >> blocksize_bits;
719 set_buffer_mapped(bh);
720 continue;
721 }
722
723 if (lcn == LCN_HOLE) {
724 u8 *kaddr;
725 unsigned long *bpos, *bend;
726
727
728 kaddr = kmap_atomic(page);
729 bpos = (unsigned long *)(kaddr + bh_offset(bh));
730 bend = (unsigned long *)((u8*)bpos + blocksize);
731 do {
732 if (unlikely(*bpos))
733 break;
734 } while (likely(++bpos < bend));
735 kunmap_atomic(kaddr);
736 if (bpos == bend) {
737
738
739
740
741 bh->b_blocknr = -1;
742 clear_buffer_dirty(bh);
743 continue;
744 }
745
746
747
748 ntfs_error(vol->sb, "Writing into sparse regions is "
749 "not supported yet. Sorry.");
750 err = -EOPNOTSUPP;
751 break;
752 }
753
754 if (!is_retry && lcn == LCN_RL_NOT_MAPPED) {
755 is_retry = true;
756
757
758
759
760 up_read(&ni->runlist.lock);
761 err = ntfs_map_runlist(ni, vcn);
762 if (likely(!err))
763 goto lock_retry_remap;
764 rl = NULL;
765 } else if (!rl)
766 up_read(&ni->runlist.lock);
767
768
769
770
771
772 if (err == -ENOENT || lcn == LCN_ENOENT) {
773 bh->b_blocknr = -1;
774 clear_buffer_dirty(bh);
775 zero_user(page, bh_offset(bh), blocksize);
776 set_buffer_uptodate(bh);
777 err = 0;
778 continue;
779 }
780
781 if (!err)
782 err = -EIO;
783 bh->b_blocknr = -1;
784 ntfs_error(vol->sb, "Failed to write to inode 0x%lx, "
785 "attribute type 0x%x, vcn 0x%llx, offset 0x%x "
786 "because its location on disk could not be "
787 "determined%s (error code %i).", ni->mft_no,
788 ni->type, (unsigned long long)vcn,
789 vcn_ofs, is_retry ? " even after "
790 "retrying" : "", err);
791 break;
792 } while (block++, (bh = bh->b_this_page) != head);
793
794
795 if (rl)
796 up_read(&ni->runlist.lock);
797
798
799 bh = head;
800
801
802 if (unlikely(!PageUptodate(page))) {
803 int uptodate = 1;
804 do {
805 if (!buffer_uptodate(bh)) {
806 uptodate = 0;
807 bh = head;
808 break;
809 }
810 } while ((bh = bh->b_this_page) != head);
811 if (uptodate)
812 SetPageUptodate(page);
813 }
814
815
816 do {
817 if (buffer_mapped(bh) && buffer_dirty(bh)) {
818 lock_buffer(bh);
819 if (test_clear_buffer_dirty(bh)) {
820 BUG_ON(!buffer_uptodate(bh));
821 mark_buffer_async_write(bh);
822 } else
823 unlock_buffer(bh);
824 } else if (unlikely(err)) {
825
826
827
828
829 if (err != -ENOMEM)
830 clear_buffer_dirty(bh);
831 }
832 } while ((bh = bh->b_this_page) != head);
833
834 if (unlikely(err)) {
835
836 if (unlikely(err == -EOPNOTSUPP))
837 err = 0;
838 else if (err == -ENOMEM) {
839 ntfs_warning(vol->sb, "Error allocating memory. "
840 "Redirtying page so we try again "
841 "later.");
842
843
844
845
846 redirty_page_for_writepage(wbc, page);
847 err = 0;
848 } else
849 SetPageError(page);
850 }
851
852 BUG_ON(PageWriteback(page));
853 set_page_writeback(page);
854
855
856 need_end_writeback = true;
857 do {
858 struct buffer_head *next = bh->b_this_page;
859 if (buffer_async_write(bh)) {
860 submit_bh(REQ_OP_WRITE, 0, bh);
861 need_end_writeback = false;
862 }
863 bh = next;
864 } while (bh != head);
865 unlock_page(page);
866
867
868 if (unlikely(need_end_writeback))
869 end_page_writeback(page);
870
871 ntfs_debug("Done.");
872 return err;
873}
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899static int ntfs_write_mst_block(struct page *page,
900 struct writeback_control *wbc)
901{
902 sector_t block, dblock, rec_block;
903 struct inode *vi = page->mapping->host;
904 ntfs_inode *ni = NTFS_I(vi);
905 ntfs_volume *vol = ni->vol;
906 u8 *kaddr;
907 unsigned int rec_size = ni->itype.index.block_size;
908 ntfs_inode *locked_nis[PAGE_SIZE / NTFS_BLOCK_SIZE];
909 struct buffer_head *bh, *head, *tbh, *rec_start_bh;
910 struct buffer_head *bhs[MAX_BUF_PER_PAGE];
911 runlist_element *rl;
912 int i, nr_locked_nis, nr_recs, nr_bhs, max_bhs, bhs_per_rec, err, err2;
913 unsigned bh_size, rec_size_bits;
914 bool sync, is_mft, page_is_dirty, rec_is_dirty;
915 unsigned char bh_size_bits;
916
917 if (WARN_ON(rec_size < NTFS_BLOCK_SIZE))
918 return -EINVAL;
919
920 ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, page index "
921 "0x%lx.", vi->i_ino, ni->type, page->index);
922 BUG_ON(!NInoNonResident(ni));
923 BUG_ON(!NInoMstProtected(ni));
924 is_mft = (S_ISREG(vi->i_mode) && !vi->i_ino);
925
926
927
928
929
930
931 BUG_ON(!(is_mft || S_ISDIR(vi->i_mode) ||
932 (NInoAttr(ni) && ni->type == AT_INDEX_ALLOCATION)));
933 bh_size = vol->sb->s_blocksize;
934 bh_size_bits = vol->sb->s_blocksize_bits;
935 max_bhs = PAGE_SIZE / bh_size;
936 BUG_ON(!max_bhs);
937 BUG_ON(max_bhs > MAX_BUF_PER_PAGE);
938
939
940 sync = (wbc->sync_mode == WB_SYNC_ALL);
941
942
943 bh = head = page_buffers(page);
944 BUG_ON(!bh);
945
946 rec_size_bits = ni->itype.index.block_size_bits;
947 BUG_ON(!(PAGE_SIZE >> rec_size_bits));
948 bhs_per_rec = rec_size >> bh_size_bits;
949 BUG_ON(!bhs_per_rec);
950
951
952 rec_block = block = (sector_t)page->index <<
953 (PAGE_SHIFT - bh_size_bits);
954
955
956 dblock = (i_size_read(vi) + bh_size - 1) >> bh_size_bits;
957
958 rl = NULL;
959 err = err2 = nr_bhs = nr_recs = nr_locked_nis = 0;
960 page_is_dirty = rec_is_dirty = false;
961 rec_start_bh = NULL;
962 do {
963 bool is_retry = false;
964
965 if (likely(block < rec_block)) {
966 if (unlikely(block >= dblock)) {
967 clear_buffer_dirty(bh);
968 set_buffer_uptodate(bh);
969 continue;
970 }
971
972
973
974
975
976 if (!rec_is_dirty)
977 continue;
978 if (unlikely(err2)) {
979 if (err2 != -ENOMEM)
980 clear_buffer_dirty(bh);
981 continue;
982 }
983 } else {
984 BUG_ON(block > rec_block);
985
986 rec_block += bhs_per_rec;
987 err2 = 0;
988 if (unlikely(block >= dblock)) {
989 clear_buffer_dirty(bh);
990 continue;
991 }
992 if (!buffer_dirty(bh)) {
993
994 rec_is_dirty = false;
995 continue;
996 }
997 rec_is_dirty = true;
998 rec_start_bh = bh;
999 }
1000
1001 if (unlikely(!buffer_mapped(bh))) {
1002 VCN vcn;
1003 LCN lcn;
1004 unsigned int vcn_ofs;
1005
1006 bh->b_bdev = vol->sb->s_bdev;
1007
1008 vcn = (VCN)block << bh_size_bits;
1009 vcn_ofs = vcn & vol->cluster_size_mask;
1010 vcn >>= vol->cluster_size_bits;
1011 if (!rl) {
1012lock_retry_remap:
1013 down_read(&ni->runlist.lock);
1014 rl = ni->runlist.rl;
1015 }
1016 if (likely(rl != NULL)) {
1017
1018 while (rl->length && rl[1].vcn <= vcn)
1019 rl++;
1020 lcn = ntfs_rl_vcn_to_lcn(rl, vcn);
1021 } else
1022 lcn = LCN_RL_NOT_MAPPED;
1023
1024 if (likely(lcn >= 0)) {
1025
1026 bh->b_blocknr = ((lcn <<
1027 vol->cluster_size_bits) +
1028 vcn_ofs) >> bh_size_bits;
1029 set_buffer_mapped(bh);
1030 } else {
1031
1032
1033
1034
1035
1036 if (!is_mft && !is_retry &&
1037 lcn == LCN_RL_NOT_MAPPED) {
1038 is_retry = true;
1039
1040
1041
1042
1043 up_read(&ni->runlist.lock);
1044 err2 = ntfs_map_runlist(ni, vcn);
1045 if (likely(!err2))
1046 goto lock_retry_remap;
1047 if (err2 == -ENOMEM)
1048 page_is_dirty = true;
1049 lcn = err2;
1050 } else {
1051 err2 = -EIO;
1052 if (!rl)
1053 up_read(&ni->runlist.lock);
1054 }
1055
1056 if (!err || err == -ENOMEM)
1057 err = err2;
1058 bh->b_blocknr = -1;
1059 ntfs_error(vol->sb, "Cannot write ntfs record "
1060 "0x%llx (inode 0x%lx, "
1061 "attribute type 0x%x) because "
1062 "its location on disk could "
1063 "not be determined (error "
1064 "code %lli).",
1065 (long long)block <<
1066 bh_size_bits >>
1067 vol->mft_record_size_bits,
1068 ni->mft_no, ni->type,
1069 (long long)lcn);
1070
1071
1072
1073
1074
1075
1076 if (rec_start_bh != bh) {
1077 while (bhs[--nr_bhs] != rec_start_bh)
1078 ;
1079 if (err2 != -ENOMEM) {
1080 do {
1081 clear_buffer_dirty(
1082 rec_start_bh);
1083 } while ((rec_start_bh =
1084 rec_start_bh->
1085 b_this_page) !=
1086 bh);
1087 }
1088 }
1089 continue;
1090 }
1091 }
1092 BUG_ON(!buffer_uptodate(bh));
1093 BUG_ON(nr_bhs >= max_bhs);
1094 bhs[nr_bhs++] = bh;
1095 } while (block++, (bh = bh->b_this_page) != head);
1096 if (unlikely(rl))
1097 up_read(&ni->runlist.lock);
1098
1099 if (!nr_bhs)
1100 goto done;
1101
1102 kaddr = kmap(page);
1103
1104 BUG_ON(!PageUptodate(page));
1105 ClearPageUptodate(page);
1106 for (i = 0; i < nr_bhs; i++) {
1107 unsigned int ofs;
1108
1109
1110 if (i % bhs_per_rec)
1111 continue;
1112 tbh = bhs[i];
1113 ofs = bh_offset(tbh);
1114 if (is_mft) {
1115 ntfs_inode *tni;
1116 unsigned long mft_no;
1117
1118
1119 mft_no = (((s64)page->index << PAGE_SHIFT) + ofs)
1120 >> rec_size_bits;
1121
1122 tni = NULL;
1123 if (!ntfs_may_write_mft_record(vol, mft_no,
1124 (MFT_RECORD*)(kaddr + ofs), &tni)) {
1125
1126
1127
1128
1129
1130 page_is_dirty = true;
1131
1132
1133
1134
1135 do {
1136 bhs[i] = NULL;
1137 } while (++i % bhs_per_rec);
1138 continue;
1139 }
1140
1141
1142
1143
1144
1145 if (tni)
1146 locked_nis[nr_locked_nis++] = tni;
1147 }
1148
1149 err2 = pre_write_mst_fixup((NTFS_RECORD*)(kaddr + ofs),
1150 rec_size);
1151 if (unlikely(err2)) {
1152 if (!err || err == -ENOMEM)
1153 err = -EIO;
1154 ntfs_error(vol->sb, "Failed to apply mst fixups "
1155 "(inode 0x%lx, attribute type 0x%x, "
1156 "page index 0x%lx, page offset 0x%x)!"
1157 " Unmount and run chkdsk.", vi->i_ino,
1158 ni->type, page->index, ofs);
1159
1160
1161
1162
1163 do {
1164 clear_buffer_dirty(bhs[i]);
1165 bhs[i] = NULL;
1166 } while (++i % bhs_per_rec);
1167 continue;
1168 }
1169 nr_recs++;
1170 }
1171
1172 if (!nr_recs)
1173 goto unm_done;
1174 flush_dcache_page(page);
1175
1176 for (i = 0; i < nr_bhs; i++) {
1177 tbh = bhs[i];
1178 if (!tbh)
1179 continue;
1180 if (!trylock_buffer(tbh))
1181 BUG();
1182
1183 clear_buffer_dirty(tbh);
1184 BUG_ON(!buffer_uptodate(tbh));
1185 BUG_ON(!buffer_mapped(tbh));
1186 get_bh(tbh);
1187 tbh->b_end_io = end_buffer_write_sync;
1188 submit_bh(REQ_OP_WRITE, 0, tbh);
1189 }
1190
1191 if (is_mft && !sync)
1192 goto do_mirror;
1193do_wait:
1194
1195 for (i = 0; i < nr_bhs; i++) {
1196 tbh = bhs[i];
1197 if (!tbh)
1198 continue;
1199 wait_on_buffer(tbh);
1200 if (unlikely(!buffer_uptodate(tbh))) {
1201 ntfs_error(vol->sb, "I/O error while writing ntfs "
1202 "record buffer (inode 0x%lx, "
1203 "attribute type 0x%x, page index "
1204 "0x%lx, page offset 0x%lx)! Unmount "
1205 "and run chkdsk.", vi->i_ino, ni->type,
1206 page->index, bh_offset(tbh));
1207 if (!err || err == -ENOMEM)
1208 err = -EIO;
1209
1210
1211
1212
1213 set_buffer_uptodate(tbh);
1214 }
1215 }
1216
1217 if (is_mft && sync) {
1218do_mirror:
1219 for (i = 0; i < nr_bhs; i++) {
1220 unsigned long mft_no;
1221 unsigned int ofs;
1222
1223
1224
1225
1226
1227 if (i % bhs_per_rec)
1228 continue;
1229 tbh = bhs[i];
1230
1231 if (!tbh)
1232 continue;
1233 ofs = bh_offset(tbh);
1234
1235 mft_no = (((s64)page->index << PAGE_SHIFT) + ofs)
1236 >> rec_size_bits;
1237 if (mft_no < vol->mftmirr_size)
1238 ntfs_sync_mft_mirror(vol, mft_no,
1239 (MFT_RECORD*)(kaddr + ofs),
1240 sync);
1241 }
1242 if (!sync)
1243 goto do_wait;
1244 }
1245
1246 for (i = 0; i < nr_bhs; i++) {
1247 if (!(i % bhs_per_rec)) {
1248 tbh = bhs[i];
1249 if (!tbh)
1250 continue;
1251 post_write_mst_fixup((NTFS_RECORD*)(kaddr +
1252 bh_offset(tbh)));
1253 }
1254 }
1255 flush_dcache_page(page);
1256unm_done:
1257
1258 while (nr_locked_nis-- > 0) {
1259 ntfs_inode *tni, *base_tni;
1260
1261 tni = locked_nis[nr_locked_nis];
1262
1263 mutex_lock(&tni->extent_lock);
1264 if (tni->nr_extents >= 0)
1265 base_tni = tni;
1266 else {
1267 base_tni = tni->ext.base_ntfs_ino;
1268 BUG_ON(!base_tni);
1269 }
1270 mutex_unlock(&tni->extent_lock);
1271 ntfs_debug("Unlocking %s inode 0x%lx.",
1272 tni == base_tni ? "base" : "extent",
1273 tni->mft_no);
1274 mutex_unlock(&tni->mrec_lock);
1275 atomic_dec(&tni->count);
1276 iput(VFS_I(base_tni));
1277 }
1278 SetPageUptodate(page);
1279 kunmap(page);
1280done:
1281 if (unlikely(err && err != -ENOMEM)) {
1282
1283
1284
1285
1286 if (ni->itype.index.block_size == PAGE_SIZE)
1287 SetPageError(page);
1288 NVolSetErrors(vol);
1289 }
1290 if (page_is_dirty) {
1291 ntfs_debug("Page still contains one or more dirty ntfs "
1292 "records. Redirtying the page starting at "
1293 "record 0x%lx.", page->index <<
1294 (PAGE_SHIFT - rec_size_bits));
1295 redirty_page_for_writepage(wbc, page);
1296 unlock_page(page);
1297 } else {
1298
1299
1300
1301
1302
1303 BUG_ON(PageWriteback(page));
1304 set_page_writeback(page);
1305 unlock_page(page);
1306 end_page_writeback(page);
1307 }
1308 if (likely(!err))
1309 ntfs_debug("Done.");
1310 return err;
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
1336static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
1337{
1338 loff_t i_size;
1339 struct inode *vi = page->mapping->host;
1340 ntfs_inode *base_ni = NULL, *ni = NTFS_I(vi);
1341 char *addr;
1342 ntfs_attr_search_ctx *ctx = NULL;
1343 MFT_RECORD *m = NULL;
1344 u32 attr_len;
1345 int err;
1346
1347retry_writepage:
1348 BUG_ON(!PageLocked(page));
1349 i_size = i_size_read(vi);
1350
1351 if (unlikely(page->index >= (i_size + PAGE_SIZE - 1) >>
1352 PAGE_SHIFT)) {
1353
1354
1355
1356
1357 block_invalidatepage(page, 0, PAGE_SIZE);
1358 unlock_page(page);
1359 ntfs_debug("Write outside i_size - truncated?");
1360 return 0;
1361 }
1362
1363
1364
1365
1366
1367
1368
1369
1370 if (ni->type != AT_INDEX_ALLOCATION) {
1371
1372 if (NInoEncrypted(ni)) {
1373 unlock_page(page);
1374 BUG_ON(ni->type != AT_DATA);
1375 ntfs_debug("Denying write access to encrypted file.");
1376 return -EACCES;
1377 }
1378
1379 if (NInoNonResident(ni) && NInoCompressed(ni)) {
1380 BUG_ON(ni->type != AT_DATA);
1381 BUG_ON(ni->name_len);
1382
1383
1384 unlock_page(page);
1385 ntfs_error(vi->i_sb, "Writing to compressed files is "
1386 "not supported yet. Sorry.");
1387 return -EOPNOTSUPP;
1388 }
1389
1390 if (NInoNonResident(ni) && NInoSparse(ni)) {
1391 unlock_page(page);
1392 ntfs_error(vi->i_sb, "Writing to sparse files is not "
1393 "supported yet. Sorry.");
1394 return -EOPNOTSUPP;
1395 }
1396 }
1397
1398 if (NInoNonResident(ni)) {
1399
1400 if (page->index >= (i_size >> PAGE_SHIFT)) {
1401
1402 unsigned int ofs = i_size & ~PAGE_MASK;
1403 zero_user_segment(page, ofs, PAGE_SIZE);
1404 }
1405
1406 if (NInoMstProtected(ni))
1407 return ntfs_write_mst_block(page, wbc);
1408
1409 return ntfs_write_block(page, wbc);
1410 }
1411
1412
1413
1414
1415
1416
1417
1418
1419 BUG_ON(page_has_buffers(page));
1420 BUG_ON(!PageUptodate(page));
1421 if (unlikely(page->index > 0)) {
1422 ntfs_error(vi->i_sb, "BUG()! page->index (0x%lx) > 0. "
1423 "Aborting write.", page->index);
1424 BUG_ON(PageWriteback(page));
1425 set_page_writeback(page);
1426 unlock_page(page);
1427 end_page_writeback(page);
1428 return -EIO;
1429 }
1430 if (!NInoAttr(ni))
1431 base_ni = ni;
1432 else
1433 base_ni = ni->ext.base_ntfs_ino;
1434
1435 m = map_mft_record(base_ni);
1436 if (IS_ERR(m)) {
1437 err = PTR_ERR(m);
1438 m = NULL;
1439 ctx = NULL;
1440 goto err_out;
1441 }
1442
1443
1444
1445
1446 if (unlikely(NInoNonResident(ni))) {
1447 unmap_mft_record(base_ni);
1448 goto retry_writepage;
1449 }
1450 ctx = ntfs_attr_get_search_ctx(base_ni, m);
1451 if (unlikely(!ctx)) {
1452 err = -ENOMEM;
1453 goto err_out;
1454 }
1455 err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
1456 CASE_SENSITIVE, 0, NULL, 0, ctx);
1457 if (unlikely(err))
1458 goto err_out;
1459
1460
1461
1462
1463 BUG_ON(PageWriteback(page));
1464 set_page_writeback(page);
1465 unlock_page(page);
1466 attr_len = le32_to_cpu(ctx->attr->data.resident.value_length);
1467 i_size = i_size_read(vi);
1468 if (unlikely(attr_len > i_size)) {
1469
1470 attr_len = i_size;
1471
1472
1473
1474
1475 err = ntfs_resident_attr_value_resize(ctx->mrec, ctx->attr,
1476 attr_len);
1477
1478 BUG_ON(err);
1479 }
1480 addr = kmap_atomic(page);
1481
1482 memcpy((u8*)ctx->attr +
1483 le16_to_cpu(ctx->attr->data.resident.value_offset),
1484 addr, attr_len);
1485
1486 memset(addr + attr_len, 0, PAGE_SIZE - attr_len);
1487 kunmap_atomic(addr);
1488 flush_dcache_page(page);
1489 flush_dcache_mft_record_page(ctx->ntfs_ino);
1490
1491 end_page_writeback(page);
1492
1493 mark_mft_record_dirty(ctx->ntfs_ino);
1494 ntfs_attr_put_search_ctx(ctx);
1495 unmap_mft_record(base_ni);
1496 return 0;
1497err_out:
1498 if (err == -ENOMEM) {
1499 ntfs_warning(vi->i_sb, "Error allocating memory. Redirtying "
1500 "page so we try again later.");
1501
1502
1503
1504
1505 redirty_page_for_writepage(wbc, page);
1506 err = 0;
1507 } else {
1508 ntfs_error(vi->i_sb, "Resident attribute write failed with "
1509 "error %i.", err);
1510 SetPageError(page);
1511 NVolSetErrors(ni->vol);
1512 }
1513 unlock_page(page);
1514 if (ctx)
1515 ntfs_attr_put_search_ctx(ctx);
1516 if (m)
1517 unmap_mft_record(base_ni);
1518 return err;
1519}
1520
1521#endif
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546static sector_t ntfs_bmap(struct address_space *mapping, sector_t block)
1547{
1548 s64 ofs, size;
1549 loff_t i_size;
1550 LCN lcn;
1551 unsigned long blocksize, flags;
1552 ntfs_inode *ni = NTFS_I(mapping->host);
1553 ntfs_volume *vol = ni->vol;
1554 unsigned delta;
1555 unsigned char blocksize_bits, cluster_size_shift;
1556
1557 ntfs_debug("Entering for mft_no 0x%lx, logical block 0x%llx.",
1558 ni->mft_no, (unsigned long long)block);
1559 if (ni->type != AT_DATA || !NInoNonResident(ni) || NInoEncrypted(ni)) {
1560 ntfs_error(vol->sb, "BMAP does not make sense for %s "
1561 "attributes, returning 0.",
1562 (ni->type != AT_DATA) ? "non-data" :
1563 (!NInoNonResident(ni) ? "resident" :
1564 "encrypted"));
1565 return 0;
1566 }
1567
1568 BUG_ON(NInoCompressed(ni));
1569 BUG_ON(NInoMstProtected(ni));
1570 blocksize = vol->sb->s_blocksize;
1571 blocksize_bits = vol->sb->s_blocksize_bits;
1572 ofs = (s64)block << blocksize_bits;
1573 read_lock_irqsave(&ni->size_lock, flags);
1574 size = ni->initialized_size;
1575 i_size = i_size_read(VFS_I(ni));
1576 read_unlock_irqrestore(&ni->size_lock, flags);
1577
1578
1579
1580
1581
1582 if (unlikely(ofs >= size || (ofs + blocksize > size && size < i_size)))
1583 goto hole;
1584 cluster_size_shift = vol->cluster_size_bits;
1585 down_read(&ni->runlist.lock);
1586 lcn = ntfs_attr_vcn_to_lcn_nolock(ni, ofs >> cluster_size_shift, false);
1587 up_read(&ni->runlist.lock);
1588 if (unlikely(lcn < LCN_HOLE)) {
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598 switch ((int)lcn) {
1599 case LCN_ENOENT:
1600
1601
1602
1603
1604 goto hole;
1605 case LCN_ENOMEM:
1606 ntfs_error(vol->sb, "Not enough memory to complete "
1607 "mapping for inode 0x%lx. "
1608 "Returning 0.", ni->mft_no);
1609 break;
1610 default:
1611 ntfs_error(vol->sb, "Failed to complete mapping for "
1612 "inode 0x%lx. Run chkdsk. "
1613 "Returning 0.", ni->mft_no);
1614 break;
1615 }
1616 return 0;
1617 }
1618 if (lcn < 0) {
1619
1620hole:
1621 ntfs_debug("Done (returning hole).");
1622 return 0;
1623 }
1624
1625
1626
1627
1628 delta = ofs & vol->cluster_size_mask;
1629 if (unlikely(sizeof(block) < sizeof(lcn))) {
1630 block = lcn = ((lcn << cluster_size_shift) + delta) >>
1631 blocksize_bits;
1632
1633 if (unlikely(block != lcn)) {
1634 ntfs_error(vol->sb, "Physical block 0x%llx is too "
1635 "large to be returned, returning 0.",
1636 (long long)lcn);
1637 return 0;
1638 }
1639 } else
1640 block = ((lcn << cluster_size_shift) + delta) >>
1641 blocksize_bits;
1642 ntfs_debug("Done (returning block 0x%llx).", (unsigned long long)lcn);
1643 return block;
1644}
1645
1646
1647
1648
1649
1650
1651
1652const struct address_space_operations ntfs_normal_aops = {
1653 .readpage = ntfs_readpage,
1654#ifdef NTFS_RW
1655 .writepage = ntfs_writepage,
1656 .set_page_dirty = __set_page_dirty_buffers,
1657#endif
1658 .bmap = ntfs_bmap,
1659 .migratepage = buffer_migrate_page,
1660 .is_partially_uptodate = block_is_partially_uptodate,
1661 .error_remove_page = generic_error_remove_page,
1662};
1663
1664
1665
1666
1667const struct address_space_operations ntfs_compressed_aops = {
1668 .readpage = ntfs_readpage,
1669#ifdef NTFS_RW
1670 .writepage = ntfs_writepage,
1671 .set_page_dirty = __set_page_dirty_buffers,
1672#endif
1673 .migratepage = buffer_migrate_page,
1674 .is_partially_uptodate = block_is_partially_uptodate,
1675 .error_remove_page = generic_error_remove_page,
1676};
1677
1678
1679
1680
1681
1682const struct address_space_operations ntfs_mst_aops = {
1683 .readpage = ntfs_readpage,
1684#ifdef NTFS_RW
1685 .writepage = ntfs_writepage,
1686 .set_page_dirty = __set_page_dirty_nobuffers,
1687
1688
1689#endif
1690 .migratepage = buffer_migrate_page,
1691 .is_partially_uptodate = block_is_partially_uptodate,
1692 .error_remove_page = generic_error_remove_page,
1693};
1694
1695#ifdef NTFS_RW
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712void mark_ntfs_record_dirty(struct page *page, const unsigned int ofs) {
1713 struct address_space *mapping = page->mapping;
1714 ntfs_inode *ni = NTFS_I(mapping->host);
1715 struct buffer_head *bh, *head, *buffers_to_free = NULL;
1716 unsigned int end, bh_size, bh_ofs;
1717
1718 BUG_ON(!PageUptodate(page));
1719 end = ofs + ni->itype.index.block_size;
1720 bh_size = VFS_I(ni)->i_sb->s_blocksize;
1721 spin_lock(&mapping->private_lock);
1722 if (unlikely(!page_has_buffers(page))) {
1723 spin_unlock(&mapping->private_lock);
1724 bh = head = alloc_page_buffers(page, bh_size, true);
1725 spin_lock(&mapping->private_lock);
1726 if (likely(!page_has_buffers(page))) {
1727 struct buffer_head *tail;
1728
1729 do {
1730 set_buffer_uptodate(bh);
1731 tail = bh;
1732 bh = bh->b_this_page;
1733 } while (bh);
1734 tail->b_this_page = head;
1735 attach_page_private(page, head);
1736 } else
1737 buffers_to_free = bh;
1738 }
1739 bh = head = page_buffers(page);
1740 BUG_ON(!bh);
1741 do {
1742 bh_ofs = bh_offset(bh);
1743 if (bh_ofs + bh_size <= ofs)
1744 continue;
1745 if (unlikely(bh_ofs >= end))
1746 break;
1747 set_buffer_dirty(bh);
1748 } while ((bh = bh->b_this_page) != head);
1749 spin_unlock(&mapping->private_lock);
1750 __set_page_dirty_nobuffers(page);
1751 if (unlikely(buffers_to_free)) {
1752 do {
1753 bh = buffers_to_free->b_this_page;
1754 free_buffer_head(buffers_to_free);
1755 buffers_to_free = bh;
1756 } while (buffers_to_free);
1757 }
1758}
1759
1760#endif
1761