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15#include "qemu/osdep.h"
16#include "qapi/error.h"
17#include "qemu/timer.h"
18#include "trace.h"
19#include "qed.h"
20#include "qapi/qmp/qerror.h"
21#include "migration/migration.h"
22#include "sysemu/block-backend.h"
23
24static const AIOCBInfo qed_aiocb_info = {
25 .aiocb_size = sizeof(QEDAIOCB),
26};
27
28static int bdrv_qed_probe(const uint8_t *buf, int buf_size,
29 const char *filename)
30{
31 const QEDHeader *header = (const QEDHeader *)buf;
32
33 if (buf_size < sizeof(*header)) {
34 return 0;
35 }
36 if (le32_to_cpu(header->magic) != QED_MAGIC) {
37 return 0;
38 }
39 return 100;
40}
41
42
43
44
45
46
47static bool qed_fmt_is_raw(const char *fmt)
48{
49 return fmt && strcmp(fmt, "raw") == 0;
50}
51
52static void qed_header_le_to_cpu(const QEDHeader *le, QEDHeader *cpu)
53{
54 cpu->magic = le32_to_cpu(le->magic);
55 cpu->cluster_size = le32_to_cpu(le->cluster_size);
56 cpu->table_size = le32_to_cpu(le->table_size);
57 cpu->header_size = le32_to_cpu(le->header_size);
58 cpu->features = le64_to_cpu(le->features);
59 cpu->compat_features = le64_to_cpu(le->compat_features);
60 cpu->autoclear_features = le64_to_cpu(le->autoclear_features);
61 cpu->l1_table_offset = le64_to_cpu(le->l1_table_offset);
62 cpu->image_size = le64_to_cpu(le->image_size);
63 cpu->backing_filename_offset = le32_to_cpu(le->backing_filename_offset);
64 cpu->backing_filename_size = le32_to_cpu(le->backing_filename_size);
65}
66
67static void qed_header_cpu_to_le(const QEDHeader *cpu, QEDHeader *le)
68{
69 le->magic = cpu_to_le32(cpu->magic);
70 le->cluster_size = cpu_to_le32(cpu->cluster_size);
71 le->table_size = cpu_to_le32(cpu->table_size);
72 le->header_size = cpu_to_le32(cpu->header_size);
73 le->features = cpu_to_le64(cpu->features);
74 le->compat_features = cpu_to_le64(cpu->compat_features);
75 le->autoclear_features = cpu_to_le64(cpu->autoclear_features);
76 le->l1_table_offset = cpu_to_le64(cpu->l1_table_offset);
77 le->image_size = cpu_to_le64(cpu->image_size);
78 le->backing_filename_offset = cpu_to_le32(cpu->backing_filename_offset);
79 le->backing_filename_size = cpu_to_le32(cpu->backing_filename_size);
80}
81
82int qed_write_header_sync(BDRVQEDState *s)
83{
84 QEDHeader le;
85 int ret;
86
87 qed_header_cpu_to_le(&s->header, &le);
88 ret = bdrv_pwrite(s->bs->file->bs, 0, &le, sizeof(le));
89 if (ret != sizeof(le)) {
90 return ret;
91 }
92 return 0;
93}
94
95typedef struct {
96 GenericCB gencb;
97 BDRVQEDState *s;
98 struct iovec iov;
99 QEMUIOVector qiov;
100 int nsectors;
101 uint8_t *buf;
102} QEDWriteHeaderCB;
103
104static void qed_write_header_cb(void *opaque, int ret)
105{
106 QEDWriteHeaderCB *write_header_cb = opaque;
107
108 qemu_vfree(write_header_cb->buf);
109 gencb_complete(write_header_cb, ret);
110}
111
112static void qed_write_header_read_cb(void *opaque, int ret)
113{
114 QEDWriteHeaderCB *write_header_cb = opaque;
115 BDRVQEDState *s = write_header_cb->s;
116
117 if (ret) {
118 qed_write_header_cb(write_header_cb, ret);
119 return;
120 }
121
122
123 qed_header_cpu_to_le(&s->header, (QEDHeader *)write_header_cb->buf);
124
125 bdrv_aio_writev(s->bs->file->bs, 0, &write_header_cb->qiov,
126 write_header_cb->nsectors, qed_write_header_cb,
127 write_header_cb);
128}
129
130
131
132
133
134
135
136static void qed_write_header(BDRVQEDState *s, BlockCompletionFunc cb,
137 void *opaque)
138{
139
140
141
142
143
144
145 int nsectors = (sizeof(QEDHeader) + BDRV_SECTOR_SIZE - 1) /
146 BDRV_SECTOR_SIZE;
147 size_t len = nsectors * BDRV_SECTOR_SIZE;
148 QEDWriteHeaderCB *write_header_cb = gencb_alloc(sizeof(*write_header_cb),
149 cb, opaque);
150
151 write_header_cb->s = s;
152 write_header_cb->nsectors = nsectors;
153 write_header_cb->buf = qemu_blockalign(s->bs, len);
154 write_header_cb->iov.iov_base = write_header_cb->buf;
155 write_header_cb->iov.iov_len = len;
156 qemu_iovec_init_external(&write_header_cb->qiov, &write_header_cb->iov, 1);
157
158 bdrv_aio_readv(s->bs->file->bs, 0, &write_header_cb->qiov, nsectors,
159 qed_write_header_read_cb, write_header_cb);
160}
161
162static uint64_t qed_max_image_size(uint32_t cluster_size, uint32_t table_size)
163{
164 uint64_t table_entries;
165 uint64_t l2_size;
166
167 table_entries = (table_size * cluster_size) / sizeof(uint64_t);
168 l2_size = table_entries * cluster_size;
169
170 return l2_size * table_entries;
171}
172
173static bool qed_is_cluster_size_valid(uint32_t cluster_size)
174{
175 if (cluster_size < QED_MIN_CLUSTER_SIZE ||
176 cluster_size > QED_MAX_CLUSTER_SIZE) {
177 return false;
178 }
179 if (cluster_size & (cluster_size - 1)) {
180 return false;
181 }
182 return true;
183}
184
185static bool qed_is_table_size_valid(uint32_t table_size)
186{
187 if (table_size < QED_MIN_TABLE_SIZE ||
188 table_size > QED_MAX_TABLE_SIZE) {
189 return false;
190 }
191 if (table_size & (table_size - 1)) {
192 return false;
193 }
194 return true;
195}
196
197static bool qed_is_image_size_valid(uint64_t image_size, uint32_t cluster_size,
198 uint32_t table_size)
199{
200 if (image_size % BDRV_SECTOR_SIZE != 0) {
201 return false;
202 }
203 if (image_size > qed_max_image_size(cluster_size, table_size)) {
204 return false;
205 }
206 return true;
207}
208
209
210
211
212
213
214
215
216
217
218
219
220
221static int qed_read_string(BlockDriverState *file, uint64_t offset, size_t n,
222 char *buf, size_t buflen)
223{
224 int ret;
225 if (n >= buflen) {
226 return -EINVAL;
227 }
228 ret = bdrv_pread(file, offset, buf, n);
229 if (ret < 0) {
230 return ret;
231 }
232 buf[n] = '\0';
233 return 0;
234}
235
236
237
238
239
240
241
242
243
244
245
246
247static uint64_t qed_alloc_clusters(BDRVQEDState *s, unsigned int n)
248{
249 uint64_t offset = s->file_size;
250 s->file_size += n * s->header.cluster_size;
251 return offset;
252}
253
254QEDTable *qed_alloc_table(BDRVQEDState *s)
255{
256
257 return qemu_blockalign(s->bs,
258 s->header.cluster_size * s->header.table_size);
259}
260
261
262
263
264static CachedL2Table *qed_new_l2_table(BDRVQEDState *s)
265{
266 CachedL2Table *l2_table = qed_alloc_l2_cache_entry(&s->l2_cache);
267
268 l2_table->table = qed_alloc_table(s);
269 l2_table->offset = qed_alloc_clusters(s, s->header.table_size);
270
271 memset(l2_table->table->offsets, 0,
272 s->header.cluster_size * s->header.table_size);
273 return l2_table;
274}
275
276static void qed_aio_next_io(void *opaque, int ret);
277
278static void qed_plug_allocating_write_reqs(BDRVQEDState *s)
279{
280 assert(!s->allocating_write_reqs_plugged);
281
282 s->allocating_write_reqs_plugged = true;
283}
284
285static void qed_unplug_allocating_write_reqs(BDRVQEDState *s)
286{
287 QEDAIOCB *acb;
288
289 assert(s->allocating_write_reqs_plugged);
290
291 s->allocating_write_reqs_plugged = false;
292
293 acb = QSIMPLEQ_FIRST(&s->allocating_write_reqs);
294 if (acb) {
295 qed_aio_next_io(acb, 0);
296 }
297}
298
299static void qed_finish_clear_need_check(void *opaque, int ret)
300{
301
302}
303
304static void qed_flush_after_clear_need_check(void *opaque, int ret)
305{
306 BDRVQEDState *s = opaque;
307
308 bdrv_aio_flush(s->bs, qed_finish_clear_need_check, s);
309
310
311 qed_unplug_allocating_write_reqs(s);
312}
313
314static void qed_clear_need_check(void *opaque, int ret)
315{
316 BDRVQEDState *s = opaque;
317
318 if (ret) {
319 qed_unplug_allocating_write_reqs(s);
320 return;
321 }
322
323 s->header.features &= ~QED_F_NEED_CHECK;
324 qed_write_header(s, qed_flush_after_clear_need_check, s);
325}
326
327static void qed_need_check_timer_cb(void *opaque)
328{
329 BDRVQEDState *s = opaque;
330
331
332 assert(!QSIMPLEQ_FIRST(&s->allocating_write_reqs));
333
334 trace_qed_need_check_timer_cb(s);
335
336 qed_plug_allocating_write_reqs(s);
337
338
339 bdrv_aio_flush(s->bs, qed_clear_need_check, s);
340}
341
342static void qed_start_need_check_timer(BDRVQEDState *s)
343{
344 trace_qed_start_need_check_timer(s);
345
346
347
348
349 timer_mod(s->need_check_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
350 NANOSECONDS_PER_SECOND * QED_NEED_CHECK_TIMEOUT);
351}
352
353
354static void qed_cancel_need_check_timer(BDRVQEDState *s)
355{
356 trace_qed_cancel_need_check_timer(s);
357 timer_del(s->need_check_timer);
358}
359
360static void bdrv_qed_detach_aio_context(BlockDriverState *bs)
361{
362 BDRVQEDState *s = bs->opaque;
363
364 qed_cancel_need_check_timer(s);
365 timer_free(s->need_check_timer);
366}
367
368static void bdrv_qed_attach_aio_context(BlockDriverState *bs,
369 AioContext *new_context)
370{
371 BDRVQEDState *s = bs->opaque;
372
373 s->need_check_timer = aio_timer_new(new_context,
374 QEMU_CLOCK_VIRTUAL, SCALE_NS,
375 qed_need_check_timer_cb, s);
376 if (s->header.features & QED_F_NEED_CHECK) {
377 qed_start_need_check_timer(s);
378 }
379}
380
381static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
382 Error **errp)
383{
384 BDRVQEDState *s = bs->opaque;
385 QEDHeader le_header;
386 int64_t file_size;
387 int ret;
388
389 s->bs = bs;
390 QSIMPLEQ_INIT(&s->allocating_write_reqs);
391
392 ret = bdrv_pread(bs->file->bs, 0, &le_header, sizeof(le_header));
393 if (ret < 0) {
394 return ret;
395 }
396 qed_header_le_to_cpu(&le_header, &s->header);
397
398 if (s->header.magic != QED_MAGIC) {
399 error_setg(errp, "Image not in QED format");
400 return -EINVAL;
401 }
402 if (s->header.features & ~QED_FEATURE_MASK) {
403
404 error_setg(errp, "Unsupported QED features: %" PRIx64,
405 s->header.features & ~QED_FEATURE_MASK);
406 return -ENOTSUP;
407 }
408 if (!qed_is_cluster_size_valid(s->header.cluster_size)) {
409 return -EINVAL;
410 }
411
412
413 file_size = bdrv_getlength(bs->file->bs);
414 if (file_size < 0) {
415 return file_size;
416 }
417 s->file_size = qed_start_of_cluster(s, file_size);
418
419 if (!qed_is_table_size_valid(s->header.table_size)) {
420 return -EINVAL;
421 }
422 if (!qed_is_image_size_valid(s->header.image_size,
423 s->header.cluster_size,
424 s->header.table_size)) {
425 return -EINVAL;
426 }
427 if (!qed_check_table_offset(s, s->header.l1_table_offset)) {
428 return -EINVAL;
429 }
430
431 s->table_nelems = (s->header.cluster_size * s->header.table_size) /
432 sizeof(uint64_t);
433 s->l2_shift = ctz32(s->header.cluster_size);
434 s->l2_mask = s->table_nelems - 1;
435 s->l1_shift = s->l2_shift + ctz32(s->table_nelems);
436
437
438 if (s->header.header_size > UINT32_MAX / s->header.cluster_size) {
439 return -EINVAL;
440 }
441
442 if ((s->header.features & QED_F_BACKING_FILE)) {
443 if ((uint64_t)s->header.backing_filename_offset +
444 s->header.backing_filename_size >
445 s->header.cluster_size * s->header.header_size) {
446 return -EINVAL;
447 }
448
449 ret = qed_read_string(bs->file->bs, s->header.backing_filename_offset,
450 s->header.backing_filename_size, bs->backing_file,
451 sizeof(bs->backing_file));
452 if (ret < 0) {
453 return ret;
454 }
455
456 if (s->header.features & QED_F_BACKING_FORMAT_NO_PROBE) {
457 pstrcpy(bs->backing_format, sizeof(bs->backing_format), "raw");
458 }
459 }
460
461
462
463
464
465
466
467 if ((s->header.autoclear_features & ~QED_AUTOCLEAR_FEATURE_MASK) != 0 &&
468 !bdrv_is_read_only(bs->file->bs) && !(flags & BDRV_O_INACTIVE)) {
469 s->header.autoclear_features &= QED_AUTOCLEAR_FEATURE_MASK;
470
471 ret = qed_write_header_sync(s);
472 if (ret) {
473 return ret;
474 }
475
476
477 bdrv_flush(bs->file->bs);
478 }
479
480 s->l1_table = qed_alloc_table(s);
481 qed_init_l2_cache(&s->l2_cache);
482
483 ret = qed_read_l1_table_sync(s);
484 if (ret) {
485 goto out;
486 }
487
488
489 if (!(flags & BDRV_O_CHECK) && (s->header.features & QED_F_NEED_CHECK)) {
490
491
492
493
494
495 if (!bdrv_is_read_only(bs->file->bs) &&
496 !(flags & BDRV_O_INACTIVE)) {
497 BdrvCheckResult result = {0};
498
499 ret = qed_check(s, &result, true);
500 if (ret) {
501 goto out;
502 }
503 }
504 }
505
506 bdrv_qed_attach_aio_context(bs, bdrv_get_aio_context(bs));
507
508out:
509 if (ret) {
510 qed_free_l2_cache(&s->l2_cache);
511 qemu_vfree(s->l1_table);
512 }
513 return ret;
514}
515
516static void bdrv_qed_refresh_limits(BlockDriverState *bs, Error **errp)
517{
518 BDRVQEDState *s = bs->opaque;
519
520 bs->bl.write_zeroes_alignment = s->header.cluster_size >> BDRV_SECTOR_BITS;
521}
522
523
524
525static int bdrv_qed_reopen_prepare(BDRVReopenState *state,
526 BlockReopenQueue *queue, Error **errp)
527{
528 return 0;
529}
530
531static void bdrv_qed_close(BlockDriverState *bs)
532{
533 BDRVQEDState *s = bs->opaque;
534
535 bdrv_qed_detach_aio_context(bs);
536
537
538 bdrv_flush(bs->file->bs);
539
540
541 if (s->header.features & QED_F_NEED_CHECK) {
542 s->header.features &= ~QED_F_NEED_CHECK;
543 qed_write_header_sync(s);
544 }
545
546 qed_free_l2_cache(&s->l2_cache);
547 qemu_vfree(s->l1_table);
548}
549
550static int qed_create(const char *filename, uint32_t cluster_size,
551 uint64_t image_size, uint32_t table_size,
552 const char *backing_file, const char *backing_fmt,
553 QemuOpts *opts, Error **errp)
554{
555 QEDHeader header = {
556 .magic = QED_MAGIC,
557 .cluster_size = cluster_size,
558 .table_size = table_size,
559 .header_size = 1,
560 .features = 0,
561 .compat_features = 0,
562 .l1_table_offset = cluster_size,
563 .image_size = image_size,
564 };
565 QEDHeader le_header;
566 uint8_t *l1_table = NULL;
567 size_t l1_size = header.cluster_size * header.table_size;
568 Error *local_err = NULL;
569 int ret = 0;
570 BlockBackend *blk;
571
572 ret = bdrv_create_file(filename, opts, &local_err);
573 if (ret < 0) {
574 error_propagate(errp, local_err);
575 return ret;
576 }
577
578 blk = blk_new_open(filename, NULL, NULL,
579 BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err);
580 if (blk == NULL) {
581 error_propagate(errp, local_err);
582 return -EIO;
583 }
584
585 blk_set_allow_write_beyond_eof(blk, true);
586
587
588 ret = blk_truncate(blk, 0);
589 if (ret < 0) {
590 goto out;
591 }
592
593 if (backing_file) {
594 header.features |= QED_F_BACKING_FILE;
595 header.backing_filename_offset = sizeof(le_header);
596 header.backing_filename_size = strlen(backing_file);
597
598 if (qed_fmt_is_raw(backing_fmt)) {
599 header.features |= QED_F_BACKING_FORMAT_NO_PROBE;
600 }
601 }
602
603 qed_header_cpu_to_le(&header, &le_header);
604 ret = blk_pwrite(blk, 0, &le_header, sizeof(le_header));
605 if (ret < 0) {
606 goto out;
607 }
608 ret = blk_pwrite(blk, sizeof(le_header), backing_file,
609 header.backing_filename_size);
610 if (ret < 0) {
611 goto out;
612 }
613
614 l1_table = g_malloc0(l1_size);
615 ret = blk_pwrite(blk, header.l1_table_offset, l1_table, l1_size);
616 if (ret < 0) {
617 goto out;
618 }
619
620 ret = 0;
621out:
622 g_free(l1_table);
623 blk_unref(blk);
624 return ret;
625}
626
627static int bdrv_qed_create(const char *filename, QemuOpts *opts, Error **errp)
628{
629 uint64_t image_size = 0;
630 uint32_t cluster_size = QED_DEFAULT_CLUSTER_SIZE;
631 uint32_t table_size = QED_DEFAULT_TABLE_SIZE;
632 char *backing_file = NULL;
633 char *backing_fmt = NULL;
634 int ret;
635
636 image_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
637 BDRV_SECTOR_SIZE);
638 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
639 backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT);
640 cluster_size = qemu_opt_get_size_del(opts,
641 BLOCK_OPT_CLUSTER_SIZE,
642 QED_DEFAULT_CLUSTER_SIZE);
643 table_size = qemu_opt_get_size_del(opts, BLOCK_OPT_TABLE_SIZE,
644 QED_DEFAULT_TABLE_SIZE);
645
646 if (!qed_is_cluster_size_valid(cluster_size)) {
647 error_setg(errp, "QED cluster size must be within range [%u, %u] "
648 "and power of 2",
649 QED_MIN_CLUSTER_SIZE, QED_MAX_CLUSTER_SIZE);
650 ret = -EINVAL;
651 goto finish;
652 }
653 if (!qed_is_table_size_valid(table_size)) {
654 error_setg(errp, "QED table size must be within range [%u, %u] "
655 "and power of 2",
656 QED_MIN_TABLE_SIZE, QED_MAX_TABLE_SIZE);
657 ret = -EINVAL;
658 goto finish;
659 }
660 if (!qed_is_image_size_valid(image_size, cluster_size, table_size)) {
661 error_setg(errp, "QED image size must be a non-zero multiple of "
662 "cluster size and less than %" PRIu64 " bytes",
663 qed_max_image_size(cluster_size, table_size));
664 ret = -EINVAL;
665 goto finish;
666 }
667
668 ret = qed_create(filename, cluster_size, image_size, table_size,
669 backing_file, backing_fmt, opts, errp);
670
671finish:
672 g_free(backing_file);
673 g_free(backing_fmt);
674 return ret;
675}
676
677typedef struct {
678 BlockDriverState *bs;
679 Coroutine *co;
680 uint64_t pos;
681 int64_t status;
682 int *pnum;
683 BlockDriverState **file;
684} QEDIsAllocatedCB;
685
686static void qed_is_allocated_cb(void *opaque, int ret, uint64_t offset, size_t len)
687{
688 QEDIsAllocatedCB *cb = opaque;
689 BDRVQEDState *s = cb->bs->opaque;
690 *cb->pnum = len / BDRV_SECTOR_SIZE;
691 switch (ret) {
692 case QED_CLUSTER_FOUND:
693 offset |= qed_offset_into_cluster(s, cb->pos);
694 cb->status = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset;
695 *cb->file = cb->bs->file->bs;
696 break;
697 case QED_CLUSTER_ZERO:
698 cb->status = BDRV_BLOCK_ZERO;
699 break;
700 case QED_CLUSTER_L2:
701 case QED_CLUSTER_L1:
702 cb->status = 0;
703 break;
704 default:
705 assert(ret < 0);
706 cb->status = ret;
707 break;
708 }
709
710 if (cb->co) {
711 qemu_coroutine_enter(cb->co, NULL);
712 }
713}
714
715static int64_t coroutine_fn bdrv_qed_co_get_block_status(BlockDriverState *bs,
716 int64_t sector_num,
717 int nb_sectors, int *pnum,
718 BlockDriverState **file)
719{
720 BDRVQEDState *s = bs->opaque;
721 size_t len = (size_t)nb_sectors * BDRV_SECTOR_SIZE;
722 QEDIsAllocatedCB cb = {
723 .bs = bs,
724 .pos = (uint64_t)sector_num * BDRV_SECTOR_SIZE,
725 .status = BDRV_BLOCK_OFFSET_MASK,
726 .pnum = pnum,
727 .file = file,
728 };
729 QEDRequest request = { .l2_table = NULL };
730
731 qed_find_cluster(s, &request, cb.pos, len, qed_is_allocated_cb, &cb);
732
733
734 while (cb.status == BDRV_BLOCK_OFFSET_MASK) {
735 cb.co = qemu_coroutine_self();
736 qemu_coroutine_yield();
737 }
738
739 qed_unref_l2_cache_entry(request.l2_table);
740
741 return cb.status;
742}
743
744static BDRVQEDState *acb_to_s(QEDAIOCB *acb)
745{
746 return acb->common.bs->opaque;
747}
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762static void qed_read_backing_file(BDRVQEDState *s, uint64_t pos,
763 QEMUIOVector *qiov,
764 QEMUIOVector **backing_qiov,
765 BlockCompletionFunc *cb, void *opaque)
766{
767 uint64_t backing_length = 0;
768 size_t size;
769
770
771
772
773 if (s->bs->backing) {
774 int64_t l = bdrv_getlength(s->bs->backing->bs);
775 if (l < 0) {
776 cb(opaque, l);
777 return;
778 }
779 backing_length = l;
780 }
781
782
783 if (pos >= backing_length ||
784 pos + qiov->size > backing_length) {
785 qemu_iovec_memset(qiov, 0, 0, qiov->size);
786 }
787
788
789 if (pos >= backing_length) {
790 cb(opaque, 0);
791 return;
792 }
793
794
795 size = MIN((uint64_t)backing_length - pos, qiov->size);
796
797 assert(*backing_qiov == NULL);
798 *backing_qiov = g_new(QEMUIOVector, 1);
799 qemu_iovec_init(*backing_qiov, qiov->niov);
800 qemu_iovec_concat(*backing_qiov, qiov, 0, size);
801
802 BLKDBG_EVENT(s->bs->file, BLKDBG_READ_BACKING_AIO);
803 bdrv_aio_readv(s->bs->backing->bs, pos / BDRV_SECTOR_SIZE,
804 *backing_qiov, size / BDRV_SECTOR_SIZE, cb, opaque);
805}
806
807typedef struct {
808 GenericCB gencb;
809 BDRVQEDState *s;
810 QEMUIOVector qiov;
811 QEMUIOVector *backing_qiov;
812 struct iovec iov;
813 uint64_t offset;
814} CopyFromBackingFileCB;
815
816static void qed_copy_from_backing_file_cb(void *opaque, int ret)
817{
818 CopyFromBackingFileCB *copy_cb = opaque;
819 qemu_vfree(copy_cb->iov.iov_base);
820 gencb_complete(©_cb->gencb, ret);
821}
822
823static void qed_copy_from_backing_file_write(void *opaque, int ret)
824{
825 CopyFromBackingFileCB *copy_cb = opaque;
826 BDRVQEDState *s = copy_cb->s;
827
828 if (copy_cb->backing_qiov) {
829 qemu_iovec_destroy(copy_cb->backing_qiov);
830 g_free(copy_cb->backing_qiov);
831 copy_cb->backing_qiov = NULL;
832 }
833
834 if (ret) {
835 qed_copy_from_backing_file_cb(copy_cb, ret);
836 return;
837 }
838
839 BLKDBG_EVENT(s->bs->file, BLKDBG_COW_WRITE);
840 bdrv_aio_writev(s->bs->file->bs, copy_cb->offset / BDRV_SECTOR_SIZE,
841 ©_cb->qiov, copy_cb->qiov.size / BDRV_SECTOR_SIZE,
842 qed_copy_from_backing_file_cb, copy_cb);
843}
844
845
846
847
848
849
850
851
852
853
854
855static void qed_copy_from_backing_file(BDRVQEDState *s, uint64_t pos,
856 uint64_t len, uint64_t offset,
857 BlockCompletionFunc *cb,
858 void *opaque)
859{
860 CopyFromBackingFileCB *copy_cb;
861
862
863 if (len == 0) {
864 cb(opaque, 0);
865 return;
866 }
867
868 copy_cb = gencb_alloc(sizeof(*copy_cb), cb, opaque);
869 copy_cb->s = s;
870 copy_cb->offset = offset;
871 copy_cb->backing_qiov = NULL;
872 copy_cb->iov.iov_base = qemu_blockalign(s->bs, len);
873 copy_cb->iov.iov_len = len;
874 qemu_iovec_init_external(©_cb->qiov, ©_cb->iov, 1);
875
876 qed_read_backing_file(s, pos, ©_cb->qiov, ©_cb->backing_qiov,
877 qed_copy_from_backing_file_write, copy_cb);
878}
879
880
881
882
883
884
885
886
887
888
889
890
891
892static void qed_update_l2_table(BDRVQEDState *s, QEDTable *table, int index,
893 unsigned int n, uint64_t cluster)
894{
895 int i;
896 for (i = index; i < index + n; i++) {
897 table->offsets[i] = cluster;
898 if (!qed_offset_is_unalloc_cluster(cluster) &&
899 !qed_offset_is_zero_cluster(cluster)) {
900 cluster += s->header.cluster_size;
901 }
902 }
903}
904
905static void qed_aio_complete_bh(void *opaque)
906{
907 QEDAIOCB *acb = opaque;
908 BlockCompletionFunc *cb = acb->common.cb;
909 void *user_opaque = acb->common.opaque;
910 int ret = acb->bh_ret;
911
912 qemu_bh_delete(acb->bh);
913 qemu_aio_unref(acb);
914
915
916 cb(user_opaque, ret);
917}
918
919static void qed_aio_complete(QEDAIOCB *acb, int ret)
920{
921 BDRVQEDState *s = acb_to_s(acb);
922
923 trace_qed_aio_complete(s, acb, ret);
924
925
926 qemu_iovec_destroy(&acb->cur_qiov);
927 qed_unref_l2_cache_entry(acb->request.l2_table);
928
929
930 if (acb->flags & QED_AIOCB_ZERO) {
931 qemu_vfree(acb->qiov->iov[0].iov_base);
932 acb->qiov->iov[0].iov_base = NULL;
933 }
934
935
936 acb->bh_ret = ret;
937 acb->bh = aio_bh_new(bdrv_get_aio_context(acb->common.bs),
938 qed_aio_complete_bh, acb);
939 qemu_bh_schedule(acb->bh);
940
941
942
943
944
945
946
947 if (acb == QSIMPLEQ_FIRST(&s->allocating_write_reqs)) {
948 QSIMPLEQ_REMOVE_HEAD(&s->allocating_write_reqs, next);
949 acb = QSIMPLEQ_FIRST(&s->allocating_write_reqs);
950 if (acb) {
951 qed_aio_next_io(acb, 0);
952 } else if (s->header.features & QED_F_NEED_CHECK) {
953 qed_start_need_check_timer(s);
954 }
955 }
956}
957
958
959
960
961static void qed_commit_l2_update(void *opaque, int ret)
962{
963 QEDAIOCB *acb = opaque;
964 BDRVQEDState *s = acb_to_s(acb);
965 CachedL2Table *l2_table = acb->request.l2_table;
966 uint64_t l2_offset = l2_table->offset;
967
968 qed_commit_l2_cache_entry(&s->l2_cache, l2_table);
969
970
971
972
973 acb->request.l2_table = qed_find_l2_cache_entry(&s->l2_cache, l2_offset);
974 assert(acb->request.l2_table != NULL);
975
976 qed_aio_next_io(opaque, ret);
977}
978
979
980
981
982static void qed_aio_write_l1_update(void *opaque, int ret)
983{
984 QEDAIOCB *acb = opaque;
985 BDRVQEDState *s = acb_to_s(acb);
986 int index;
987
988 if (ret) {
989 qed_aio_complete(acb, ret);
990 return;
991 }
992
993 index = qed_l1_index(s, acb->cur_pos);
994 s->l1_table->offsets[index] = acb->request.l2_table->offset;
995
996 qed_write_l1_table(s, index, 1, qed_commit_l2_update, acb);
997}
998
999
1000
1001
1002static void qed_aio_write_l2_update(QEDAIOCB *acb, int ret, uint64_t offset)
1003{
1004 BDRVQEDState *s = acb_to_s(acb);
1005 bool need_alloc = acb->find_cluster_ret == QED_CLUSTER_L1;
1006 int index;
1007
1008 if (ret) {
1009 goto err;
1010 }
1011
1012 if (need_alloc) {
1013 qed_unref_l2_cache_entry(acb->request.l2_table);
1014 acb->request.l2_table = qed_new_l2_table(s);
1015 }
1016
1017 index = qed_l2_index(s, acb->cur_pos);
1018 qed_update_l2_table(s, acb->request.l2_table->table, index, acb->cur_nclusters,
1019 offset);
1020
1021 if (need_alloc) {
1022
1023 qed_write_l2_table(s, &acb->request, 0, s->table_nelems, true,
1024 qed_aio_write_l1_update, acb);
1025 } else {
1026
1027 qed_write_l2_table(s, &acb->request, index, acb->cur_nclusters, false,
1028 qed_aio_next_io, acb);
1029 }
1030 return;
1031
1032err:
1033 qed_aio_complete(acb, ret);
1034}
1035
1036static void qed_aio_write_l2_update_cb(void *opaque, int ret)
1037{
1038 QEDAIOCB *acb = opaque;
1039 qed_aio_write_l2_update(acb, ret, acb->cur_cluster);
1040}
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051static void qed_aio_write_flush_before_l2_update(void *opaque, int ret)
1052{
1053 QEDAIOCB *acb = opaque;
1054 BDRVQEDState *s = acb_to_s(acb);
1055
1056 if (!bdrv_aio_flush(s->bs->file->bs, qed_aio_write_l2_update_cb, opaque)) {
1057 qed_aio_complete(acb, -EIO);
1058 }
1059}
1060
1061
1062
1063
1064static void qed_aio_write_main(void *opaque, int ret)
1065{
1066 QEDAIOCB *acb = opaque;
1067 BDRVQEDState *s = acb_to_s(acb);
1068 uint64_t offset = acb->cur_cluster +
1069 qed_offset_into_cluster(s, acb->cur_pos);
1070 BlockCompletionFunc *next_fn;
1071
1072 trace_qed_aio_write_main(s, acb, ret, offset, acb->cur_qiov.size);
1073
1074 if (ret) {
1075 qed_aio_complete(acb, ret);
1076 return;
1077 }
1078
1079 if (acb->find_cluster_ret == QED_CLUSTER_FOUND) {
1080 next_fn = qed_aio_next_io;
1081 } else {
1082 if (s->bs->backing) {
1083 next_fn = qed_aio_write_flush_before_l2_update;
1084 } else {
1085 next_fn = qed_aio_write_l2_update_cb;
1086 }
1087 }
1088
1089 BLKDBG_EVENT(s->bs->file, BLKDBG_WRITE_AIO);
1090 bdrv_aio_writev(s->bs->file->bs, offset / BDRV_SECTOR_SIZE,
1091 &acb->cur_qiov, acb->cur_qiov.size / BDRV_SECTOR_SIZE,
1092 next_fn, acb);
1093}
1094
1095
1096
1097
1098static void qed_aio_write_postfill(void *opaque, int ret)
1099{
1100 QEDAIOCB *acb = opaque;
1101 BDRVQEDState *s = acb_to_s(acb);
1102 uint64_t start = acb->cur_pos + acb->cur_qiov.size;
1103 uint64_t len =
1104 qed_start_of_cluster(s, start + s->header.cluster_size - 1) - start;
1105 uint64_t offset = acb->cur_cluster +
1106 qed_offset_into_cluster(s, acb->cur_pos) +
1107 acb->cur_qiov.size;
1108
1109 if (ret) {
1110 qed_aio_complete(acb, ret);
1111 return;
1112 }
1113
1114 trace_qed_aio_write_postfill(s, acb, start, len, offset);
1115 qed_copy_from_backing_file(s, start, len, offset,
1116 qed_aio_write_main, acb);
1117}
1118
1119
1120
1121
1122static void qed_aio_write_prefill(void *opaque, int ret)
1123{
1124 QEDAIOCB *acb = opaque;
1125 BDRVQEDState *s = acb_to_s(acb);
1126 uint64_t start = qed_start_of_cluster(s, acb->cur_pos);
1127 uint64_t len = qed_offset_into_cluster(s, acb->cur_pos);
1128
1129 trace_qed_aio_write_prefill(s, acb, start, len, acb->cur_cluster);
1130 qed_copy_from_backing_file(s, start, len, acb->cur_cluster,
1131 qed_aio_write_postfill, acb);
1132}
1133
1134
1135
1136
1137static bool qed_should_set_need_check(BDRVQEDState *s)
1138{
1139
1140 if (s->bs->backing) {
1141 return false;
1142 }
1143
1144 return !(s->header.features & QED_F_NEED_CHECK);
1145}
1146
1147static void qed_aio_write_zero_cluster(void *opaque, int ret)
1148{
1149 QEDAIOCB *acb = opaque;
1150
1151 if (ret) {
1152 qed_aio_complete(acb, ret);
1153 return;
1154 }
1155
1156 qed_aio_write_l2_update(acb, 0, 1);
1157}
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167static void qed_aio_write_alloc(QEDAIOCB *acb, size_t len)
1168{
1169 BDRVQEDState *s = acb_to_s(acb);
1170 BlockCompletionFunc *cb;
1171
1172
1173 if (QSIMPLEQ_EMPTY(&s->allocating_write_reqs)) {
1174 qed_cancel_need_check_timer(s);
1175 }
1176
1177
1178 if (acb != QSIMPLEQ_FIRST(&s->allocating_write_reqs)) {
1179 QSIMPLEQ_INSERT_TAIL(&s->allocating_write_reqs, acb, next);
1180 }
1181 if (acb != QSIMPLEQ_FIRST(&s->allocating_write_reqs) ||
1182 s->allocating_write_reqs_plugged) {
1183 return;
1184 }
1185
1186 acb->cur_nclusters = qed_bytes_to_clusters(s,
1187 qed_offset_into_cluster(s, acb->cur_pos) + len);
1188 qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
1189
1190 if (acb->flags & QED_AIOCB_ZERO) {
1191
1192 if (acb->find_cluster_ret == QED_CLUSTER_ZERO) {
1193 qed_aio_next_io(acb, 0);
1194 return;
1195 }
1196
1197 cb = qed_aio_write_zero_cluster;
1198 } else {
1199 cb = qed_aio_write_prefill;
1200 acb->cur_cluster = qed_alloc_clusters(s, acb->cur_nclusters);
1201 }
1202
1203 if (qed_should_set_need_check(s)) {
1204 s->header.features |= QED_F_NEED_CHECK;
1205 qed_write_header(s, cb, acb);
1206 } else {
1207 cb(acb, 0);
1208 }
1209}
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220static void qed_aio_write_inplace(QEDAIOCB *acb, uint64_t offset, size_t len)
1221{
1222
1223 if (acb->flags & QED_AIOCB_ZERO) {
1224 struct iovec *iov = acb->qiov->iov;
1225
1226 if (!iov->iov_base) {
1227 iov->iov_base = qemu_try_blockalign(acb->common.bs, iov->iov_len);
1228 if (iov->iov_base == NULL) {
1229 qed_aio_complete(acb, -ENOMEM);
1230 return;
1231 }
1232 memset(iov->iov_base, 0, iov->iov_len);
1233 }
1234 }
1235
1236
1237 acb->cur_cluster = offset;
1238 qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
1239
1240
1241 qed_aio_write_main(acb, 0);
1242}
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255static void qed_aio_write_data(void *opaque, int ret,
1256 uint64_t offset, size_t len)
1257{
1258 QEDAIOCB *acb = opaque;
1259
1260 trace_qed_aio_write_data(acb_to_s(acb), acb, ret, offset, len);
1261
1262 acb->find_cluster_ret = ret;
1263
1264 switch (ret) {
1265 case QED_CLUSTER_FOUND:
1266 qed_aio_write_inplace(acb, offset, len);
1267 break;
1268
1269 case QED_CLUSTER_L2:
1270 case QED_CLUSTER_L1:
1271 case QED_CLUSTER_ZERO:
1272 qed_aio_write_alloc(acb, len);
1273 break;
1274
1275 default:
1276 qed_aio_complete(acb, ret);
1277 break;
1278 }
1279}
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292static void qed_aio_read_data(void *opaque, int ret,
1293 uint64_t offset, size_t len)
1294{
1295 QEDAIOCB *acb = opaque;
1296 BDRVQEDState *s = acb_to_s(acb);
1297 BlockDriverState *bs = acb->common.bs;
1298
1299
1300 offset += qed_offset_into_cluster(s, acb->cur_pos);
1301
1302 trace_qed_aio_read_data(s, acb, ret, offset, len);
1303
1304 if (ret < 0) {
1305 goto err;
1306 }
1307
1308 qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
1309
1310
1311 if (ret == QED_CLUSTER_ZERO) {
1312 qemu_iovec_memset(&acb->cur_qiov, 0, 0, acb->cur_qiov.size);
1313 qed_aio_next_io(acb, 0);
1314 return;
1315 } else if (ret != QED_CLUSTER_FOUND) {
1316 qed_read_backing_file(s, acb->cur_pos, &acb->cur_qiov,
1317 &acb->backing_qiov, qed_aio_next_io, acb);
1318 return;
1319 }
1320
1321 BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
1322 bdrv_aio_readv(bs->file->bs, offset / BDRV_SECTOR_SIZE,
1323 &acb->cur_qiov, acb->cur_qiov.size / BDRV_SECTOR_SIZE,
1324 qed_aio_next_io, acb);
1325 return;
1326
1327err:
1328 qed_aio_complete(acb, ret);
1329}
1330
1331
1332
1333
1334static void qed_aio_next_io(void *opaque, int ret)
1335{
1336 QEDAIOCB *acb = opaque;
1337 BDRVQEDState *s = acb_to_s(acb);
1338 QEDFindClusterFunc *io_fn = (acb->flags & QED_AIOCB_WRITE) ?
1339 qed_aio_write_data : qed_aio_read_data;
1340
1341 trace_qed_aio_next_io(s, acb, ret, acb->cur_pos + acb->cur_qiov.size);
1342
1343 if (acb->backing_qiov) {
1344 qemu_iovec_destroy(acb->backing_qiov);
1345 g_free(acb->backing_qiov);
1346 acb->backing_qiov = NULL;
1347 }
1348
1349
1350 if (ret) {
1351 qed_aio_complete(acb, ret);
1352 return;
1353 }
1354
1355 acb->qiov_offset += acb->cur_qiov.size;
1356 acb->cur_pos += acb->cur_qiov.size;
1357 qemu_iovec_reset(&acb->cur_qiov);
1358
1359
1360 if (acb->cur_pos >= acb->end_pos) {
1361 qed_aio_complete(acb, 0);
1362 return;
1363 }
1364
1365
1366 qed_find_cluster(s, &acb->request,
1367 acb->cur_pos, acb->end_pos - acb->cur_pos,
1368 io_fn, acb);
1369}
1370
1371static BlockAIOCB *qed_aio_setup(BlockDriverState *bs,
1372 int64_t sector_num,
1373 QEMUIOVector *qiov, int nb_sectors,
1374 BlockCompletionFunc *cb,
1375 void *opaque, int flags)
1376{
1377 QEDAIOCB *acb = qemu_aio_get(&qed_aiocb_info, bs, cb, opaque);
1378
1379 trace_qed_aio_setup(bs->opaque, acb, sector_num, nb_sectors,
1380 opaque, flags);
1381
1382 acb->flags = flags;
1383 acb->qiov = qiov;
1384 acb->qiov_offset = 0;
1385 acb->cur_pos = (uint64_t)sector_num * BDRV_SECTOR_SIZE;
1386 acb->end_pos = acb->cur_pos + nb_sectors * BDRV_SECTOR_SIZE;
1387 acb->backing_qiov = NULL;
1388 acb->request.l2_table = NULL;
1389 qemu_iovec_init(&acb->cur_qiov, qiov->niov);
1390
1391
1392 qed_aio_next_io(acb, 0);
1393 return &acb->common;
1394}
1395
1396static BlockAIOCB *bdrv_qed_aio_readv(BlockDriverState *bs,
1397 int64_t sector_num,
1398 QEMUIOVector *qiov, int nb_sectors,
1399 BlockCompletionFunc *cb,
1400 void *opaque)
1401{
1402 return qed_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
1403}
1404
1405static BlockAIOCB *bdrv_qed_aio_writev(BlockDriverState *bs,
1406 int64_t sector_num,
1407 QEMUIOVector *qiov, int nb_sectors,
1408 BlockCompletionFunc *cb,
1409 void *opaque)
1410{
1411 return qed_aio_setup(bs, sector_num, qiov, nb_sectors, cb,
1412 opaque, QED_AIOCB_WRITE);
1413}
1414
1415typedef struct {
1416 Coroutine *co;
1417 int ret;
1418 bool done;
1419} QEDWriteZeroesCB;
1420
1421static void coroutine_fn qed_co_write_zeroes_cb(void *opaque, int ret)
1422{
1423 QEDWriteZeroesCB *cb = opaque;
1424
1425 cb->done = true;
1426 cb->ret = ret;
1427 if (cb->co) {
1428 qemu_coroutine_enter(cb->co, NULL);
1429 }
1430}
1431
1432static int coroutine_fn bdrv_qed_co_write_zeroes(BlockDriverState *bs,
1433 int64_t sector_num,
1434 int nb_sectors,
1435 BdrvRequestFlags flags)
1436{
1437 BlockAIOCB *blockacb;
1438 BDRVQEDState *s = bs->opaque;
1439 QEDWriteZeroesCB cb = { .done = false };
1440 QEMUIOVector qiov;
1441 struct iovec iov;
1442
1443
1444 if (bs->backing) {
1445 if (qed_offset_into_cluster(s, sector_num * BDRV_SECTOR_SIZE) != 0) {
1446 return -ENOTSUP;
1447 }
1448 if (qed_offset_into_cluster(s, nb_sectors * BDRV_SECTOR_SIZE) != 0) {
1449 return -ENOTSUP;
1450 }
1451 }
1452
1453
1454
1455
1456 iov.iov_base = NULL,
1457 iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE,
1458
1459 qemu_iovec_init_external(&qiov, &iov, 1);
1460 blockacb = qed_aio_setup(bs, sector_num, &qiov, nb_sectors,
1461 qed_co_write_zeroes_cb, &cb,
1462 QED_AIOCB_WRITE | QED_AIOCB_ZERO);
1463 if (!blockacb) {
1464 return -EIO;
1465 }
1466 if (!cb.done) {
1467 cb.co = qemu_coroutine_self();
1468 qemu_coroutine_yield();
1469 }
1470 assert(cb.done);
1471 return cb.ret;
1472}
1473
1474static int bdrv_qed_truncate(BlockDriverState *bs, int64_t offset)
1475{
1476 BDRVQEDState *s = bs->opaque;
1477 uint64_t old_image_size;
1478 int ret;
1479
1480 if (!qed_is_image_size_valid(offset, s->header.cluster_size,
1481 s->header.table_size)) {
1482 return -EINVAL;
1483 }
1484
1485
1486 if ((uint64_t)offset < s->header.image_size) {
1487 return -ENOTSUP;
1488 }
1489
1490 old_image_size = s->header.image_size;
1491 s->header.image_size = offset;
1492 ret = qed_write_header_sync(s);
1493 if (ret < 0) {
1494 s->header.image_size = old_image_size;
1495 }
1496 return ret;
1497}
1498
1499static int64_t bdrv_qed_getlength(BlockDriverState *bs)
1500{
1501 BDRVQEDState *s = bs->opaque;
1502 return s->header.image_size;
1503}
1504
1505static int bdrv_qed_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1506{
1507 BDRVQEDState *s = bs->opaque;
1508
1509 memset(bdi, 0, sizeof(*bdi));
1510 bdi->cluster_size = s->header.cluster_size;
1511 bdi->is_dirty = s->header.features & QED_F_NEED_CHECK;
1512 bdi->unallocated_blocks_are_zero = true;
1513 bdi->can_write_zeroes_with_unmap = true;
1514 return 0;
1515}
1516
1517static int bdrv_qed_change_backing_file(BlockDriverState *bs,
1518 const char *backing_file,
1519 const char *backing_fmt)
1520{
1521 BDRVQEDState *s = bs->opaque;
1522 QEDHeader new_header, le_header;
1523 void *buffer;
1524 size_t buffer_len, backing_file_len;
1525 int ret;
1526
1527
1528
1529
1530
1531
1532 if (backing_file && (s->header.compat_features &
1533 ~QED_COMPAT_FEATURE_MASK)) {
1534 return -ENOTSUP;
1535 }
1536
1537 memcpy(&new_header, &s->header, sizeof(new_header));
1538
1539 new_header.features &= ~(QED_F_BACKING_FILE |
1540 QED_F_BACKING_FORMAT_NO_PROBE);
1541
1542
1543 if (backing_file) {
1544 new_header.features |= QED_F_BACKING_FILE;
1545
1546 if (qed_fmt_is_raw(backing_fmt)) {
1547 new_header.features |= QED_F_BACKING_FORMAT_NO_PROBE;
1548 }
1549 }
1550
1551
1552 backing_file_len = 0;
1553
1554 if (backing_file) {
1555 backing_file_len = strlen(backing_file);
1556 }
1557
1558 buffer_len = sizeof(new_header);
1559 new_header.backing_filename_offset = buffer_len;
1560 new_header.backing_filename_size = backing_file_len;
1561 buffer_len += backing_file_len;
1562
1563
1564 if (buffer_len > new_header.header_size * new_header.cluster_size) {
1565 return -ENOSPC;
1566 }
1567
1568
1569 buffer = g_malloc(buffer_len);
1570
1571 qed_header_cpu_to_le(&new_header, &le_header);
1572 memcpy(buffer, &le_header, sizeof(le_header));
1573 buffer_len = sizeof(le_header);
1574
1575 if (backing_file) {
1576 memcpy(buffer + buffer_len, backing_file, backing_file_len);
1577 buffer_len += backing_file_len;
1578 }
1579
1580
1581 ret = bdrv_pwrite_sync(bs->file->bs, 0, buffer, buffer_len);
1582 g_free(buffer);
1583 if (ret == 0) {
1584 memcpy(&s->header, &new_header, sizeof(new_header));
1585 }
1586 return ret;
1587}
1588
1589static void bdrv_qed_invalidate_cache(BlockDriverState *bs, Error **errp)
1590{
1591 BDRVQEDState *s = bs->opaque;
1592 Error *local_err = NULL;
1593 int ret;
1594
1595 bdrv_qed_close(bs);
1596
1597 bdrv_invalidate_cache(bs->file->bs, &local_err);
1598 if (local_err) {
1599 error_propagate(errp, local_err);
1600 return;
1601 }
1602
1603 memset(s, 0, sizeof(BDRVQEDState));
1604 ret = bdrv_qed_open(bs, NULL, bs->open_flags, &local_err);
1605 if (local_err) {
1606 error_propagate(errp, local_err);
1607 error_prepend(errp, "Could not reopen qed layer: ");
1608 return;
1609 } else if (ret < 0) {
1610 error_setg_errno(errp, -ret, "Could not reopen qed layer");
1611 return;
1612 }
1613}
1614
1615static int bdrv_qed_check(BlockDriverState *bs, BdrvCheckResult *result,
1616 BdrvCheckMode fix)
1617{
1618 BDRVQEDState *s = bs->opaque;
1619
1620 return qed_check(s, result, !!fix);
1621}
1622
1623static QemuOptsList qed_create_opts = {
1624 .name = "qed-create-opts",
1625 .head = QTAILQ_HEAD_INITIALIZER(qed_create_opts.head),
1626 .desc = {
1627 {
1628 .name = BLOCK_OPT_SIZE,
1629 .type = QEMU_OPT_SIZE,
1630 .help = "Virtual disk size"
1631 },
1632 {
1633 .name = BLOCK_OPT_BACKING_FILE,
1634 .type = QEMU_OPT_STRING,
1635 .help = "File name of a base image"
1636 },
1637 {
1638 .name = BLOCK_OPT_BACKING_FMT,
1639 .type = QEMU_OPT_STRING,
1640 .help = "Image format of the base image"
1641 },
1642 {
1643 .name = BLOCK_OPT_CLUSTER_SIZE,
1644 .type = QEMU_OPT_SIZE,
1645 .help = "Cluster size (in bytes)",
1646 .def_value_str = stringify(QED_DEFAULT_CLUSTER_SIZE)
1647 },
1648 {
1649 .name = BLOCK_OPT_TABLE_SIZE,
1650 .type = QEMU_OPT_SIZE,
1651 .help = "L1/L2 table size (in clusters)"
1652 },
1653 { }
1654 }
1655};
1656
1657static BlockDriver bdrv_qed = {
1658 .format_name = "qed",
1659 .instance_size = sizeof(BDRVQEDState),
1660 .create_opts = &qed_create_opts,
1661 .supports_backing = true,
1662
1663 .bdrv_probe = bdrv_qed_probe,
1664 .bdrv_open = bdrv_qed_open,
1665 .bdrv_close = bdrv_qed_close,
1666 .bdrv_reopen_prepare = bdrv_qed_reopen_prepare,
1667 .bdrv_create = bdrv_qed_create,
1668 .bdrv_has_zero_init = bdrv_has_zero_init_1,
1669 .bdrv_co_get_block_status = bdrv_qed_co_get_block_status,
1670 .bdrv_aio_readv = bdrv_qed_aio_readv,
1671 .bdrv_aio_writev = bdrv_qed_aio_writev,
1672 .bdrv_co_write_zeroes = bdrv_qed_co_write_zeroes,
1673 .bdrv_truncate = bdrv_qed_truncate,
1674 .bdrv_getlength = bdrv_qed_getlength,
1675 .bdrv_get_info = bdrv_qed_get_info,
1676 .bdrv_refresh_limits = bdrv_qed_refresh_limits,
1677 .bdrv_change_backing_file = bdrv_qed_change_backing_file,
1678 .bdrv_invalidate_cache = bdrv_qed_invalidate_cache,
1679 .bdrv_check = bdrv_qed_check,
1680 .bdrv_detach_aio_context = bdrv_qed_detach_aio_context,
1681 .bdrv_attach_aio_context = bdrv_qed_attach_aio_context,
1682};
1683
1684static void bdrv_qed_init(void)
1685{
1686 bdrv_register(&bdrv_qed);
1687}
1688
1689block_init(bdrv_qed_init);
1690