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20#include "qemu-common.h"
21#include "block/block_int.h"
22#include "qemu/error-report.h"
23#include "qemu/module.h"
24#include "block/vhdx.h"
25
26
27typedef struct VHDXLogSequence {
28 bool valid;
29 uint32_t count;
30 VHDXLogEntries log;
31 VHDXLogEntryHeader hdr;
32} VHDXLogSequence;
33
34typedef struct VHDXLogDescEntries {
35 VHDXLogEntryHeader hdr;
36 VHDXLogDescriptor desc[];
37} VHDXLogDescEntries;
38
39static const MSGUID zero_guid = { 0 };
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54static int vhdx_log_peek_hdr(BlockDriverState *bs, VHDXLogEntries *log,
55 VHDXLogEntryHeader *hdr)
56{
57 int ret = 0;
58 uint64_t offset;
59 uint32_t read;
60
61 assert(hdr != NULL);
62
63
64 if (log->read % VHDX_LOG_SECTOR_SIZE) {
65 ret = -EFAULT;
66 goto exit;
67 }
68
69 read = log->read;
70
71
72
73 if ((read + sizeof(VHDXLogEntryHeader)) > log->length) {
74 read = 0;
75 }
76
77 if (read == log->write) {
78 ret = -EINVAL;
79 goto exit;
80 }
81
82 offset = log->offset + read;
83
84 ret = bdrv_pread(bs->file->bs, offset, hdr, sizeof(VHDXLogEntryHeader));
85 if (ret < 0) {
86 goto exit;
87 }
88 vhdx_log_entry_hdr_le_import(hdr);
89
90exit:
91 return ret;
92}
93
94
95static int vhdx_log_inc_idx(uint32_t idx, uint64_t length)
96{
97 idx += VHDX_LOG_SECTOR_SIZE;
98
99
100
101 return idx >= length ? 0 : idx;
102}
103
104
105
106static void vhdx_log_reset(BlockDriverState *bs, BDRVVHDXState *s)
107{
108 MSGUID guid = { 0 };
109 s->log.read = s->log.write = 0;
110
111
112 vhdx_update_headers(bs, s, false, &guid);
113}
114
115
116
117
118
119
120
121
122
123
124
125
126static int vhdx_log_read_sectors(BlockDriverState *bs, VHDXLogEntries *log,
127 uint32_t *sectors_read, void *buffer,
128 uint32_t num_sectors, bool peek)
129{
130 int ret = 0;
131 uint64_t offset;
132 uint32_t read;
133
134 read = log->read;
135
136 *sectors_read = 0;
137 while (num_sectors) {
138 if (read == log->write) {
139
140 break;
141 }
142 offset = log->offset + read;
143
144 ret = bdrv_pread(bs->file->bs, offset, buffer, VHDX_LOG_SECTOR_SIZE);
145 if (ret < 0) {
146 goto exit;
147 }
148 read = vhdx_log_inc_idx(read, log->length);
149
150 *sectors_read = *sectors_read + 1;
151 num_sectors--;
152 }
153
154exit:
155 if (!peek) {
156 log->read = read;
157 }
158 return ret;
159}
160
161
162
163
164
165
166
167
168static int vhdx_log_write_sectors(BlockDriverState *bs, VHDXLogEntries *log,
169 uint32_t *sectors_written, void *buffer,
170 uint32_t num_sectors)
171{
172 int ret = 0;
173 uint64_t offset;
174 uint32_t write;
175 void *buffer_tmp;
176 BDRVVHDXState *s = bs->opaque;
177
178 ret = vhdx_user_visible_write(bs, s);
179 if (ret < 0) {
180 goto exit;
181 }
182
183 write = log->write;
184
185 buffer_tmp = buffer;
186 while (num_sectors) {
187
188 offset = log->offset + write;
189 write = vhdx_log_inc_idx(write, log->length);
190 if (write == log->read) {
191
192 break;
193 }
194 ret = bdrv_pwrite(bs->file->bs, offset, buffer_tmp,
195 VHDX_LOG_SECTOR_SIZE);
196 if (ret < 0) {
197 goto exit;
198 }
199 buffer_tmp += VHDX_LOG_SECTOR_SIZE;
200
201 log->write = write;
202 *sectors_written = *sectors_written + 1;
203 num_sectors--;
204 }
205
206exit:
207 return ret;
208}
209
210
211
212static bool vhdx_log_hdr_is_valid(VHDXLogEntries *log, VHDXLogEntryHeader *hdr,
213 BDRVVHDXState *s)
214{
215 int valid = false;
216
217 if (hdr->signature != VHDX_LOG_SIGNATURE) {
218 goto exit;
219 }
220
221
222
223 if (log->length < hdr->entry_length) {
224 goto exit;
225 }
226
227
228 if (hdr->entry_length % (VHDX_LOG_SECTOR_SIZE)) {
229 goto exit;
230 }
231
232
233 if (hdr->sequence_number == 0) {
234 goto exit;
235 }
236
237
238
239 if (!guid_eq(hdr->log_guid, s->headers[s->curr_header]->log_guid)) {
240 goto exit;
241 }
242
243 if (hdr->descriptor_count * sizeof(VHDXLogDescriptor) > hdr->entry_length) {
244 goto exit;
245 }
246
247 valid = true;
248
249exit:
250 return valid;
251}
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269static bool vhdx_log_desc_is_valid(VHDXLogDescriptor *desc,
270 VHDXLogEntryHeader *hdr)
271{
272 bool ret = false;
273
274 if (desc->sequence_number != hdr->sequence_number) {
275 goto exit;
276 }
277 if (desc->file_offset % VHDX_LOG_SECTOR_SIZE) {
278 goto exit;
279 }
280
281 if (desc->signature == VHDX_LOG_ZERO_SIGNATURE) {
282 if (desc->zero_length % VHDX_LOG_SECTOR_SIZE == 0) {
283
284 ret = true;
285 }
286 } else if (desc->signature == VHDX_LOG_DESC_SIGNATURE) {
287
288 ret = true;
289 }
290
291exit:
292 return ret;
293}
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314static int vhdx_compute_desc_sectors(uint32_t desc_cnt)
315{
316 uint32_t desc_sectors;
317
318 desc_cnt += 2;
319 desc_sectors = desc_cnt / 128;
320 if (desc_cnt % 128) {
321 desc_sectors++;
322 }
323
324 return desc_sectors;
325}
326
327
328
329
330
331
332static int vhdx_log_read_desc(BlockDriverState *bs, BDRVVHDXState *s,
333 VHDXLogEntries *log, VHDXLogDescEntries **buffer,
334 bool convert_endian)
335{
336 int ret = 0;
337 uint32_t desc_sectors;
338 uint32_t sectors_read;
339 VHDXLogEntryHeader hdr;
340 VHDXLogDescEntries *desc_entries = NULL;
341 VHDXLogDescriptor desc;
342 int i;
343
344 assert(*buffer == NULL);
345
346 ret = vhdx_log_peek_hdr(bs, log, &hdr);
347 if (ret < 0) {
348 goto exit;
349 }
350
351 if (vhdx_log_hdr_is_valid(log, &hdr, s) == false) {
352 ret = -EINVAL;
353 goto exit;
354 }
355
356 desc_sectors = vhdx_compute_desc_sectors(hdr.descriptor_count);
357 desc_entries = qemu_try_blockalign(bs->file->bs,
358 desc_sectors * VHDX_LOG_SECTOR_SIZE);
359 if (desc_entries == NULL) {
360 ret = -ENOMEM;
361 goto exit;
362 }
363
364 ret = vhdx_log_read_sectors(bs, log, §ors_read, desc_entries,
365 desc_sectors, false);
366 if (ret < 0) {
367 goto free_and_exit;
368 }
369 if (sectors_read != desc_sectors) {
370 ret = -EINVAL;
371 goto free_and_exit;
372 }
373
374
375 for (i = 0; i < hdr.descriptor_count; i++) {
376 desc = desc_entries->desc[i];
377 vhdx_log_desc_le_import(&desc);
378 if (convert_endian) {
379 desc_entries->desc[i] = desc;
380 }
381 if (vhdx_log_desc_is_valid(&desc, &hdr) == false) {
382 ret = -EINVAL;
383 goto free_and_exit;
384 }
385 }
386 if (convert_endian) {
387 desc_entries->hdr = hdr;
388 }
389
390 *buffer = desc_entries;
391 goto exit;
392
393free_and_exit:
394 qemu_vfree(desc_entries);
395exit:
396 return ret;
397}
398
399
400
401
402
403
404
405
406
407
408
409
410
411static int vhdx_log_flush_desc(BlockDriverState *bs, VHDXLogDescriptor *desc,
412 VHDXLogDataSector *data)
413{
414 int ret = 0;
415 uint64_t seq, file_offset;
416 uint32_t offset = 0;
417 void *buffer = NULL;
418 uint64_t count = 1;
419 int i;
420
421 buffer = qemu_blockalign(bs, VHDX_LOG_SECTOR_SIZE);
422
423 if (desc->signature == VHDX_LOG_DESC_SIGNATURE) {
424
425 if (data == NULL) {
426 ret = -EFAULT;
427 goto exit;
428 }
429
430
431
432 seq = data->sequence_high;
433 seq <<= 32;
434 seq |= data->sequence_low & 0xffffffff;
435
436 if (seq != desc->sequence_number) {
437 ret = -EINVAL;
438 goto exit;
439 }
440
441
442
443 memcpy(buffer, &desc->leading_bytes, 8);
444 offset += 8;
445
446 memcpy(buffer+offset, data->data, 4084);
447 offset += 4084;
448
449 memcpy(buffer+offset, &desc->trailing_bytes, 4);
450
451 } else if (desc->signature == VHDX_LOG_ZERO_SIGNATURE) {
452
453 memset(buffer, 0, VHDX_LOG_SECTOR_SIZE);
454 count = desc->zero_length / VHDX_LOG_SECTOR_SIZE;
455 } else {
456 error_report("Invalid VHDX log descriptor entry signature 0x%" PRIx32,
457 desc->signature);
458 ret = -EINVAL;
459 goto exit;
460 }
461
462 file_offset = desc->file_offset;
463
464
465 for (i = 0; i < count; i++) {
466 ret = bdrv_pwrite_sync(bs->file->bs, file_offset, buffer,
467 VHDX_LOG_SECTOR_SIZE);
468 if (ret < 0) {
469 goto exit;
470 }
471 file_offset += VHDX_LOG_SECTOR_SIZE;
472 }
473
474exit:
475 qemu_vfree(buffer);
476 return ret;
477}
478
479
480
481
482
483static int vhdx_log_flush(BlockDriverState *bs, BDRVVHDXState *s,
484 VHDXLogSequence *logs)
485{
486 int ret = 0;
487 int i;
488 uint32_t cnt, sectors_read;
489 uint64_t new_file_size;
490 void *data = NULL;
491 VHDXLogDescEntries *desc_entries = NULL;
492 VHDXLogEntryHeader hdr_tmp = { 0 };
493
494 cnt = logs->count;
495
496 data = qemu_blockalign(bs, VHDX_LOG_SECTOR_SIZE);
497
498 ret = vhdx_user_visible_write(bs, s);
499 if (ret < 0) {
500 goto exit;
501 }
502
503
504
505 while (cnt--) {
506 ret = vhdx_log_peek_hdr(bs, &logs->log, &hdr_tmp);
507 if (ret < 0) {
508 goto exit;
509 }
510
511
512
513 if (hdr_tmp.flushed_file_offset > bdrv_getlength(bs->file->bs)) {
514 ret = -EINVAL;
515 goto exit;
516 }
517
518 ret = vhdx_log_read_desc(bs, s, &logs->log, &desc_entries, true);
519 if (ret < 0) {
520 goto exit;
521 }
522
523 for (i = 0; i < desc_entries->hdr.descriptor_count; i++) {
524 if (desc_entries->desc[i].signature == VHDX_LOG_DESC_SIGNATURE) {
525
526 ret = vhdx_log_read_sectors(bs, &logs->log, §ors_read,
527 data, 1, false);
528 if (ret < 0) {
529 goto exit;
530 }
531 if (sectors_read != 1) {
532 ret = -EINVAL;
533 goto exit;
534 }
535 vhdx_log_data_le_import(data);
536 }
537
538 ret = vhdx_log_flush_desc(bs, &desc_entries->desc[i], data);
539 if (ret < 0) {
540 goto exit;
541 }
542 }
543 if (bdrv_getlength(bs->file->bs) < desc_entries->hdr.last_file_offset) {
544 new_file_size = desc_entries->hdr.last_file_offset;
545 if (new_file_size % (1024*1024)) {
546
547 new_file_size = ((new_file_size >> 20) + 1) << 20;
548 bdrv_truncate(bs->file->bs, new_file_size);
549 }
550 }
551 qemu_vfree(desc_entries);
552 desc_entries = NULL;
553 }
554
555 bdrv_flush(bs);
556
557
558 vhdx_log_reset(bs, s);
559
560exit:
561 qemu_vfree(data);
562 qemu_vfree(desc_entries);
563 return ret;
564}
565
566static int vhdx_validate_log_entry(BlockDriverState *bs, BDRVVHDXState *s,
567 VHDXLogEntries *log, uint64_t seq,
568 bool *valid, VHDXLogEntryHeader *entry)
569{
570 int ret = 0;
571 VHDXLogEntryHeader hdr;
572 void *buffer = NULL;
573 uint32_t i, desc_sectors, total_sectors, crc;
574 uint32_t sectors_read = 0;
575 VHDXLogDescEntries *desc_buffer = NULL;
576
577 *valid = false;
578
579 ret = vhdx_log_peek_hdr(bs, log, &hdr);
580 if (ret < 0) {
581 goto inc_and_exit;
582 }
583
584 if (vhdx_log_hdr_is_valid(log, &hdr, s) == false) {
585 goto inc_and_exit;
586 }
587
588 if (seq > 0) {
589 if (hdr.sequence_number != seq + 1) {
590 goto inc_and_exit;
591 }
592 }
593
594 desc_sectors = vhdx_compute_desc_sectors(hdr.descriptor_count);
595
596
597
598 total_sectors = hdr.entry_length / VHDX_LOG_SECTOR_SIZE;
599
600
601
602 ret = vhdx_log_read_desc(bs, s, log, &desc_buffer, false);
603 if (ret < 0) {
604 goto free_and_exit;
605 }
606
607 crc = vhdx_checksum_calc(0xffffffff, (void *)desc_buffer,
608 desc_sectors * VHDX_LOG_SECTOR_SIZE, 4);
609 crc ^= 0xffffffff;
610
611 buffer = qemu_blockalign(bs, VHDX_LOG_SECTOR_SIZE);
612 if (total_sectors > desc_sectors) {
613 for (i = 0; i < total_sectors - desc_sectors; i++) {
614 sectors_read = 0;
615 ret = vhdx_log_read_sectors(bs, log, §ors_read, buffer,
616 1, false);
617 if (ret < 0 || sectors_read != 1) {
618 goto free_and_exit;
619 }
620 crc = vhdx_checksum_calc(crc, buffer, VHDX_LOG_SECTOR_SIZE, -1);
621 crc ^= 0xffffffff;
622 }
623 }
624 crc ^= 0xffffffff;
625 if (crc != hdr.checksum) {
626 goto free_and_exit;
627 }
628
629 *valid = true;
630 *entry = hdr;
631 goto free_and_exit;
632
633inc_and_exit:
634 log->read = vhdx_log_inc_idx(log->read, log->length);
635
636free_and_exit:
637 qemu_vfree(buffer);
638 qemu_vfree(desc_buffer);
639 return ret;
640}
641
642
643
644
645static int vhdx_log_search(BlockDriverState *bs, BDRVVHDXState *s,
646 VHDXLogSequence *logs)
647{
648 int ret = 0;
649 uint32_t tail;
650 bool seq_valid = false;
651 VHDXLogSequence candidate = { 0 };
652 VHDXLogEntryHeader hdr = { 0 };
653 VHDXLogEntries curr_log;
654
655 memcpy(&curr_log, &s->log, sizeof(VHDXLogEntries));
656 curr_log.write = curr_log.length;
657 curr_log.read = 0;
658
659
660
661
662
663 for (;;) {
664 uint64_t curr_seq = 0;
665 VHDXLogSequence current = { 0 };
666
667 tail = curr_log.read;
668
669 ret = vhdx_validate_log_entry(bs, s, &curr_log, curr_seq,
670 &seq_valid, &hdr);
671 if (ret < 0) {
672 goto exit;
673 }
674
675 if (seq_valid) {
676 current.valid = true;
677 current.log = curr_log;
678 current.log.read = tail;
679 current.log.write = curr_log.read;
680 current.count = 1;
681 current.hdr = hdr;
682
683
684 for (;;) {
685 ret = vhdx_validate_log_entry(bs, s, &curr_log, curr_seq,
686 &seq_valid, &hdr);
687 if (ret < 0) {
688 goto exit;
689 }
690 if (seq_valid == false) {
691 break;
692 }
693 current.log.write = curr_log.read;
694 current.count++;
695
696 curr_seq = hdr.sequence_number;
697 }
698 }
699
700 if (current.valid) {
701 if (candidate.valid == false ||
702 current.hdr.sequence_number > candidate.hdr.sequence_number) {
703 candidate = current;
704 }
705 }
706
707 if (curr_log.read < tail) {
708 break;
709 }
710 }
711
712 *logs = candidate;
713
714 if (candidate.valid) {
715
716 s->log.sequence = candidate.hdr.sequence_number + 1;
717 }
718
719
720exit:
721 return ret;
722}
723
724
725
726
727
728
729int vhdx_parse_log(BlockDriverState *bs, BDRVVHDXState *s, bool *flushed,
730 Error **errp)
731{
732 int ret = 0;
733 VHDXHeader *hdr;
734 VHDXLogSequence logs = { 0 };
735
736 hdr = s->headers[s->curr_header];
737
738 *flushed = false;
739
740
741 if (s->log.hdr == NULL) {
742 s->log.hdr = qemu_blockalign(bs, sizeof(VHDXLogEntryHeader));
743 }
744
745 s->log.offset = hdr->log_offset;
746 s->log.length = hdr->log_length;
747
748 if (s->log.offset < VHDX_LOG_MIN_SIZE ||
749 s->log.offset % VHDX_LOG_MIN_SIZE) {
750 ret = -EINVAL;
751 goto exit;
752 }
753
754
755 if (hdr->log_version != 0) {
756 ret = -EINVAL;
757 goto exit;
758 }
759
760
761
762 if (guid_eq(hdr->log_guid, zero_guid)) {
763 goto exit;
764 }
765
766 if (hdr->log_length == 0) {
767 goto exit;
768 }
769
770 if (hdr->log_length % VHDX_LOG_MIN_SIZE) {
771 ret = -EINVAL;
772 goto exit;
773 }
774
775
776
777
778
779 ret = vhdx_log_search(bs, s, &logs);
780 if (ret < 0) {
781 goto exit;
782 }
783
784 if (logs.valid) {
785 if (bs->read_only) {
786 ret = -EPERM;
787 error_setg_errno(errp, EPERM,
788 "VHDX image file '%s' opened read-only, but "
789 "contains a log that needs to be replayed. To "
790 "replay the log, execute:\n qemu-img check -r "
791 "all '%s'",
792 bs->filename, bs->filename);
793 goto exit;
794 }
795
796 ret = vhdx_log_flush(bs, s, &logs);
797 if (ret < 0) {
798 goto exit;
799 }
800 *flushed = true;
801 }
802
803
804exit:
805 return ret;
806}
807
808
809
810static void vhdx_log_raw_to_le_sector(VHDXLogDescriptor *desc,
811 VHDXLogDataSector *sector, void *data,
812 uint64_t seq)
813{
814
815 memcpy(&desc->leading_bytes, data, 8);
816 data += 8;
817 cpu_to_le64s(&desc->leading_bytes);
818 memcpy(sector->data, data, 4084);
819 data += 4084;
820 memcpy(&desc->trailing_bytes, data, 4);
821 cpu_to_le32s(&desc->trailing_bytes);
822 data += 4;
823
824 sector->sequence_high = (uint32_t) (seq >> 32);
825 sector->sequence_low = (uint32_t) (seq & 0xffffffff);
826 sector->data_signature = VHDX_LOG_DATA_SIGNATURE;
827
828 vhdx_log_desc_le_export(desc);
829 vhdx_log_data_le_export(sector);
830}
831
832
833static int vhdx_log_write(BlockDriverState *bs, BDRVVHDXState *s,
834 void *data, uint32_t length, uint64_t offset)
835{
836 int ret = 0;
837 void *buffer = NULL;
838 void *merged_sector = NULL;
839 void *data_tmp, *sector_write;
840 unsigned int i;
841 int sector_offset;
842 uint32_t desc_sectors, sectors, total_length;
843 uint32_t sectors_written = 0;
844 uint32_t aligned_length;
845 uint32_t leading_length = 0;
846 uint32_t trailing_length = 0;
847 uint32_t partial_sectors = 0;
848 uint32_t bytes_written = 0;
849 uint64_t file_offset;
850 VHDXHeader *header;
851 VHDXLogEntryHeader new_hdr;
852 VHDXLogDescriptor *new_desc = NULL;
853 VHDXLogDataSector *data_sector = NULL;
854 MSGUID new_guid = { 0 };
855
856 header = s->headers[s->curr_header];
857
858
859
860 if (length > header->log_length) {
861
862 ret = -EINVAL;
863 goto exit;
864 }
865
866 if (guid_eq(header->log_guid, zero_guid)) {
867 vhdx_guid_generate(&new_guid);
868 vhdx_update_headers(bs, s, false, &new_guid);
869 } else {
870
871
872 ret = -ENOTSUP;
873 goto exit;
874 }
875
876
877
878 if (s->log.sequence == 0) {
879 s->log.sequence = 1;
880 }
881
882 sector_offset = offset % VHDX_LOG_SECTOR_SIZE;
883 file_offset = (offset / VHDX_LOG_SECTOR_SIZE) * VHDX_LOG_SECTOR_SIZE;
884
885 aligned_length = length;
886
887
888 if (sector_offset) {
889 leading_length = (VHDX_LOG_SECTOR_SIZE - sector_offset);
890 leading_length = leading_length > length ? length : leading_length;
891 aligned_length -= leading_length;
892 partial_sectors++;
893 }
894
895 sectors = aligned_length / VHDX_LOG_SECTOR_SIZE;
896 trailing_length = aligned_length - (sectors * VHDX_LOG_SECTOR_SIZE);
897 if (trailing_length) {
898 partial_sectors++;
899 }
900
901 sectors += partial_sectors;
902
903
904
905
906 new_hdr = (VHDXLogEntryHeader) {
907 .signature = VHDX_LOG_SIGNATURE,
908 .tail = s->log.tail,
909 .sequence_number = s->log.sequence,
910 .descriptor_count = sectors,
911 .reserved = 0,
912 .flushed_file_offset = bdrv_getlength(bs->file->bs),
913 .last_file_offset = bdrv_getlength(bs->file->bs),
914 };
915
916 new_hdr.log_guid = header->log_guid;
917
918 desc_sectors = vhdx_compute_desc_sectors(new_hdr.descriptor_count);
919
920 total_length = (desc_sectors + sectors) * VHDX_LOG_SECTOR_SIZE;
921 new_hdr.entry_length = total_length;
922
923 vhdx_log_entry_hdr_le_export(&new_hdr);
924
925 buffer = qemu_blockalign(bs, total_length);
926 memcpy(buffer, &new_hdr, sizeof(new_hdr));
927
928 new_desc = buffer + sizeof(new_hdr);
929 data_sector = buffer + (desc_sectors * VHDX_LOG_SECTOR_SIZE);
930 data_tmp = data;
931
932
933
934
935 merged_sector = qemu_blockalign(bs, VHDX_LOG_SECTOR_SIZE);
936
937 for (i = 0; i < sectors; i++) {
938 new_desc->signature = VHDX_LOG_DESC_SIGNATURE;
939 new_desc->sequence_number = s->log.sequence;
940 new_desc->file_offset = file_offset;
941
942 if (i == 0 && leading_length) {
943
944 ret = bdrv_pread(bs->file->bs, file_offset, merged_sector,
945 VHDX_LOG_SECTOR_SIZE);
946 if (ret < 0) {
947 goto exit;
948 }
949 memcpy(merged_sector + sector_offset, data_tmp, leading_length);
950 bytes_written = leading_length;
951 sector_write = merged_sector;
952 } else if (i == sectors - 1 && trailing_length) {
953
954 ret = bdrv_pread(bs->file->bs,
955 file_offset,
956 merged_sector + trailing_length,
957 VHDX_LOG_SECTOR_SIZE - trailing_length);
958 if (ret < 0) {
959 goto exit;
960 }
961 memcpy(merged_sector, data_tmp, trailing_length);
962 bytes_written = trailing_length;
963 sector_write = merged_sector;
964 } else {
965 bytes_written = VHDX_LOG_SECTOR_SIZE;
966 sector_write = data_tmp;
967 }
968
969
970
971
972 vhdx_log_raw_to_le_sector(new_desc, data_sector, sector_write,
973 s->log.sequence);
974
975 data_tmp += bytes_written;
976 data_sector++;
977 new_desc++;
978 file_offset += VHDX_LOG_SECTOR_SIZE;
979 }
980
981
982
983 vhdx_update_checksum(buffer, total_length,
984 offsetof(VHDXLogEntryHeader, checksum));
985
986
987 ret = vhdx_log_write_sectors(bs, &s->log, §ors_written, buffer,
988 desc_sectors + sectors);
989 if (ret < 0) {
990 goto exit;
991 }
992
993 if (sectors_written != desc_sectors + sectors) {
994
995 ret = -EINVAL;
996 goto exit;
997 }
998
999 s->log.sequence++;
1000
1001 s->log.tail = s->log.write;
1002
1003exit:
1004 qemu_vfree(buffer);
1005 qemu_vfree(merged_sector);
1006 return ret;
1007}
1008
1009
1010int vhdx_log_write_and_flush(BlockDriverState *bs, BDRVVHDXState *s,
1011 void *data, uint32_t length, uint64_t offset)
1012{
1013 int ret = 0;
1014 VHDXLogSequence logs = { .valid = true,
1015 .count = 1,
1016 .hdr = { 0 } };
1017
1018
1019
1020
1021 bdrv_flush(bs);
1022 ret = vhdx_log_write(bs, s, data, length, offset);
1023 if (ret < 0) {
1024 goto exit;
1025 }
1026 logs.log = s->log;
1027
1028
1029 bdrv_flush(bs);
1030 ret = vhdx_log_flush(bs, s, &logs);
1031 if (ret < 0) {
1032 goto exit;
1033 }
1034
1035 s->log = logs.log;
1036
1037exit:
1038 return ret;
1039}
1040
1041