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15#include "qemu/osdep.h"
16#include "qapi/error.h"
17#include "qemu/timer.h"
18#include "qemu/bswap.h"
19#include "trace.h"
20#include "qed.h"
21#include "qapi/qmp/qerror.h"
22#include "migration/migration.h"
23#include "sysemu/block-backend.h"
24
25static const AIOCBInfo qed_aiocb_info = {
26 .aiocb_size = sizeof(QEDAIOCB),
27};
28
29static int bdrv_qed_probe(const uint8_t *buf, int buf_size,
30 const char *filename)
31{
32 const QEDHeader *header = (const QEDHeader *)buf;
33
34 if (buf_size < sizeof(*header)) {
35 return 0;
36 }
37 if (le32_to_cpu(header->magic) != QED_MAGIC) {
38 return 0;
39 }
40 return 100;
41}
42
43
44
45
46
47
48static bool qed_fmt_is_raw(const char *fmt)
49{
50 return fmt && strcmp(fmt, "raw") == 0;
51}
52
53static void qed_header_le_to_cpu(const QEDHeader *le, QEDHeader *cpu)
54{
55 cpu->magic = le32_to_cpu(le->magic);
56 cpu->cluster_size = le32_to_cpu(le->cluster_size);
57 cpu->table_size = le32_to_cpu(le->table_size);
58 cpu->header_size = le32_to_cpu(le->header_size);
59 cpu->features = le64_to_cpu(le->features);
60 cpu->compat_features = le64_to_cpu(le->compat_features);
61 cpu->autoclear_features = le64_to_cpu(le->autoclear_features);
62 cpu->l1_table_offset = le64_to_cpu(le->l1_table_offset);
63 cpu->image_size = le64_to_cpu(le->image_size);
64 cpu->backing_filename_offset = le32_to_cpu(le->backing_filename_offset);
65 cpu->backing_filename_size = le32_to_cpu(le->backing_filename_size);
66}
67
68static void qed_header_cpu_to_le(const QEDHeader *cpu, QEDHeader *le)
69{
70 le->magic = cpu_to_le32(cpu->magic);
71 le->cluster_size = cpu_to_le32(cpu->cluster_size);
72 le->table_size = cpu_to_le32(cpu->table_size);
73 le->header_size = cpu_to_le32(cpu->header_size);
74 le->features = cpu_to_le64(cpu->features);
75 le->compat_features = cpu_to_le64(cpu->compat_features);
76 le->autoclear_features = cpu_to_le64(cpu->autoclear_features);
77 le->l1_table_offset = cpu_to_le64(cpu->l1_table_offset);
78 le->image_size = cpu_to_le64(cpu->image_size);
79 le->backing_filename_offset = cpu_to_le32(cpu->backing_filename_offset);
80 le->backing_filename_size = cpu_to_le32(cpu->backing_filename_size);
81}
82
83int qed_write_header_sync(BDRVQEDState *s)
84{
85 QEDHeader le;
86 int ret;
87
88 qed_header_cpu_to_le(&s->header, &le);
89 ret = bdrv_pwrite(s->bs->file, 0, &le, sizeof(le));
90 if (ret != sizeof(le)) {
91 return ret;
92 }
93 return 0;
94}
95
96typedef struct {
97 GenericCB gencb;
98 BDRVQEDState *s;
99 struct iovec iov;
100 QEMUIOVector qiov;
101 int nsectors;
102 uint8_t *buf;
103} QEDWriteHeaderCB;
104
105static void qed_write_header_cb(void *opaque, int ret)
106{
107 QEDWriteHeaderCB *write_header_cb = opaque;
108
109 qemu_vfree(write_header_cb->buf);
110 gencb_complete(write_header_cb, ret);
111}
112
113static void qed_write_header_read_cb(void *opaque, int ret)
114{
115 QEDWriteHeaderCB *write_header_cb = opaque;
116 BDRVQEDState *s = write_header_cb->s;
117
118 if (ret) {
119 qed_write_header_cb(write_header_cb, ret);
120 return;
121 }
122
123
124 qed_header_cpu_to_le(&s->header, (QEDHeader *)write_header_cb->buf);
125
126 bdrv_aio_writev(s->bs->file, 0, &write_header_cb->qiov,
127 write_header_cb->nsectors, qed_write_header_cb,
128 write_header_cb);
129}
130
131
132
133
134
135
136
137static void qed_write_header(BDRVQEDState *s, BlockCompletionFunc cb,
138 void *opaque)
139{
140
141
142
143
144
145
146 int nsectors = DIV_ROUND_UP(sizeof(QEDHeader), 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, 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(BdrvChild *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->file->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 void bdrv_qed_drain(BlockDriverState *bs)
382{
383 BDRVQEDState *s = bs->opaque;
384
385
386
387
388 if (s->need_check_timer && timer_pending(s->need_check_timer)) {
389 qed_cancel_need_check_timer(s);
390 qed_need_check_timer_cb(s);
391 }
392}
393
394static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
395 Error **errp)
396{
397 BDRVQEDState *s = bs->opaque;
398 QEDHeader le_header;
399 int64_t file_size;
400 int ret;
401
402 s->bs = bs;
403 QSIMPLEQ_INIT(&s->allocating_write_reqs);
404
405 ret = bdrv_pread(bs->file, 0, &le_header, sizeof(le_header));
406 if (ret < 0) {
407 return ret;
408 }
409 qed_header_le_to_cpu(&le_header, &s->header);
410
411 if (s->header.magic != QED_MAGIC) {
412 error_setg(errp, "Image not in QED format");
413 return -EINVAL;
414 }
415 if (s->header.features & ~QED_FEATURE_MASK) {
416
417 error_setg(errp, "Unsupported QED features: %" PRIx64,
418 s->header.features & ~QED_FEATURE_MASK);
419 return -ENOTSUP;
420 }
421 if (!qed_is_cluster_size_valid(s->header.cluster_size)) {
422 return -EINVAL;
423 }
424
425
426 file_size = bdrv_getlength(bs->file->bs);
427 if (file_size < 0) {
428 return file_size;
429 }
430 s->file_size = qed_start_of_cluster(s, file_size);
431
432 if (!qed_is_table_size_valid(s->header.table_size)) {
433 return -EINVAL;
434 }
435 if (!qed_is_image_size_valid(s->header.image_size,
436 s->header.cluster_size,
437 s->header.table_size)) {
438 return -EINVAL;
439 }
440 if (!qed_check_table_offset(s, s->header.l1_table_offset)) {
441 return -EINVAL;
442 }
443
444 s->table_nelems = (s->header.cluster_size * s->header.table_size) /
445 sizeof(uint64_t);
446 s->l2_shift = ctz32(s->header.cluster_size);
447 s->l2_mask = s->table_nelems - 1;
448 s->l1_shift = s->l2_shift + ctz32(s->table_nelems);
449
450
451 if (s->header.header_size > UINT32_MAX / s->header.cluster_size) {
452 return -EINVAL;
453 }
454
455 if ((s->header.features & QED_F_BACKING_FILE)) {
456 if ((uint64_t)s->header.backing_filename_offset +
457 s->header.backing_filename_size >
458 s->header.cluster_size * s->header.header_size) {
459 return -EINVAL;
460 }
461
462 ret = qed_read_string(bs->file, s->header.backing_filename_offset,
463 s->header.backing_filename_size, bs->backing_file,
464 sizeof(bs->backing_file));
465 if (ret < 0) {
466 return ret;
467 }
468
469 if (s->header.features & QED_F_BACKING_FORMAT_NO_PROBE) {
470 pstrcpy(bs->backing_format, sizeof(bs->backing_format), "raw");
471 }
472 }
473
474
475
476
477
478
479
480 if ((s->header.autoclear_features & ~QED_AUTOCLEAR_FEATURE_MASK) != 0 &&
481 !bdrv_is_read_only(bs->file->bs) && !(flags & BDRV_O_INACTIVE)) {
482 s->header.autoclear_features &= QED_AUTOCLEAR_FEATURE_MASK;
483
484 ret = qed_write_header_sync(s);
485 if (ret) {
486 return ret;
487 }
488
489
490 bdrv_flush(bs->file->bs);
491 }
492
493 s->l1_table = qed_alloc_table(s);
494 qed_init_l2_cache(&s->l2_cache);
495
496 ret = qed_read_l1_table_sync(s);
497 if (ret) {
498 goto out;
499 }
500
501
502 if (!(flags & BDRV_O_CHECK) && (s->header.features & QED_F_NEED_CHECK)) {
503
504
505
506
507
508 if (!bdrv_is_read_only(bs->file->bs) &&
509 !(flags & BDRV_O_INACTIVE)) {
510 BdrvCheckResult result = {0};
511
512 ret = qed_check(s, &result, true);
513 if (ret) {
514 goto out;
515 }
516 }
517 }
518
519 bdrv_qed_attach_aio_context(bs, bdrv_get_aio_context(bs));
520
521out:
522 if (ret) {
523 qed_free_l2_cache(&s->l2_cache);
524 qemu_vfree(s->l1_table);
525 }
526 return ret;
527}
528
529static void bdrv_qed_refresh_limits(BlockDriverState *bs, Error **errp)
530{
531 BDRVQEDState *s = bs->opaque;
532
533 bs->bl.pwrite_zeroes_alignment = s->header.cluster_size;
534}
535
536
537
538static int bdrv_qed_reopen_prepare(BDRVReopenState *state,
539 BlockReopenQueue *queue, Error **errp)
540{
541 return 0;
542}
543
544static void bdrv_qed_close(BlockDriverState *bs)
545{
546 BDRVQEDState *s = bs->opaque;
547
548 bdrv_qed_detach_aio_context(bs);
549
550
551 bdrv_flush(bs->file->bs);
552
553
554 if (s->header.features & QED_F_NEED_CHECK) {
555 s->header.features &= ~QED_F_NEED_CHECK;
556 qed_write_header_sync(s);
557 }
558
559 qed_free_l2_cache(&s->l2_cache);
560 qemu_vfree(s->l1_table);
561}
562
563static int qed_create(const char *filename, uint32_t cluster_size,
564 uint64_t image_size, uint32_t table_size,
565 const char *backing_file, const char *backing_fmt,
566 QemuOpts *opts, Error **errp)
567{
568 QEDHeader header = {
569 .magic = QED_MAGIC,
570 .cluster_size = cluster_size,
571 .table_size = table_size,
572 .header_size = 1,
573 .features = 0,
574 .compat_features = 0,
575 .l1_table_offset = cluster_size,
576 .image_size = image_size,
577 };
578 QEDHeader le_header;
579 uint8_t *l1_table = NULL;
580 size_t l1_size = header.cluster_size * header.table_size;
581 Error *local_err = NULL;
582 int ret = 0;
583 BlockBackend *blk;
584
585 ret = bdrv_create_file(filename, opts, &local_err);
586 if (ret < 0) {
587 error_propagate(errp, local_err);
588 return ret;
589 }
590
591 blk = blk_new_open(filename, NULL, NULL,
592 BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err);
593 if (blk == NULL) {
594 error_propagate(errp, local_err);
595 return -EIO;
596 }
597
598 blk_set_allow_write_beyond_eof(blk, true);
599
600
601 ret = blk_truncate(blk, 0);
602 if (ret < 0) {
603 goto out;
604 }
605
606 if (backing_file) {
607 header.features |= QED_F_BACKING_FILE;
608 header.backing_filename_offset = sizeof(le_header);
609 header.backing_filename_size = strlen(backing_file);
610
611 if (qed_fmt_is_raw(backing_fmt)) {
612 header.features |= QED_F_BACKING_FORMAT_NO_PROBE;
613 }
614 }
615
616 qed_header_cpu_to_le(&header, &le_header);
617 ret = blk_pwrite(blk, 0, &le_header, sizeof(le_header), 0);
618 if (ret < 0) {
619 goto out;
620 }
621 ret = blk_pwrite(blk, sizeof(le_header), backing_file,
622 header.backing_filename_size, 0);
623 if (ret < 0) {
624 goto out;
625 }
626
627 l1_table = g_malloc0(l1_size);
628 ret = blk_pwrite(blk, header.l1_table_offset, l1_table, l1_size, 0);
629 if (ret < 0) {
630 goto out;
631 }
632
633 ret = 0;
634out:
635 g_free(l1_table);
636 blk_unref(blk);
637 return ret;
638}
639
640static int bdrv_qed_create(const char *filename, QemuOpts *opts, Error **errp)
641{
642 uint64_t image_size = 0;
643 uint32_t cluster_size = QED_DEFAULT_CLUSTER_SIZE;
644 uint32_t table_size = QED_DEFAULT_TABLE_SIZE;
645 char *backing_file = NULL;
646 char *backing_fmt = NULL;
647 int ret;
648
649 image_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
650 BDRV_SECTOR_SIZE);
651 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
652 backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT);
653 cluster_size = qemu_opt_get_size_del(opts,
654 BLOCK_OPT_CLUSTER_SIZE,
655 QED_DEFAULT_CLUSTER_SIZE);
656 table_size = qemu_opt_get_size_del(opts, BLOCK_OPT_TABLE_SIZE,
657 QED_DEFAULT_TABLE_SIZE);
658
659 if (!qed_is_cluster_size_valid(cluster_size)) {
660 error_setg(errp, "QED cluster size must be within range [%u, %u] "
661 "and power of 2",
662 QED_MIN_CLUSTER_SIZE, QED_MAX_CLUSTER_SIZE);
663 ret = -EINVAL;
664 goto finish;
665 }
666 if (!qed_is_table_size_valid(table_size)) {
667 error_setg(errp, "QED table size must be within range [%u, %u] "
668 "and power of 2",
669 QED_MIN_TABLE_SIZE, QED_MAX_TABLE_SIZE);
670 ret = -EINVAL;
671 goto finish;
672 }
673 if (!qed_is_image_size_valid(image_size, cluster_size, table_size)) {
674 error_setg(errp, "QED image size must be a non-zero multiple of "
675 "cluster size and less than %" PRIu64 " bytes",
676 qed_max_image_size(cluster_size, table_size));
677 ret = -EINVAL;
678 goto finish;
679 }
680
681 ret = qed_create(filename, cluster_size, image_size, table_size,
682 backing_file, backing_fmt, opts, errp);
683
684finish:
685 g_free(backing_file);
686 g_free(backing_fmt);
687 return ret;
688}
689
690typedef struct {
691 BlockDriverState *bs;
692 Coroutine *co;
693 uint64_t pos;
694 int64_t status;
695 int *pnum;
696 BlockDriverState **file;
697} QEDIsAllocatedCB;
698
699static void qed_is_allocated_cb(void *opaque, int ret, uint64_t offset, size_t len)
700{
701 QEDIsAllocatedCB *cb = opaque;
702 BDRVQEDState *s = cb->bs->opaque;
703 *cb->pnum = len / BDRV_SECTOR_SIZE;
704 switch (ret) {
705 case QED_CLUSTER_FOUND:
706 offset |= qed_offset_into_cluster(s, cb->pos);
707 cb->status = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset;
708 *cb->file = cb->bs->file->bs;
709 break;
710 case QED_CLUSTER_ZERO:
711 cb->status = BDRV_BLOCK_ZERO;
712 break;
713 case QED_CLUSTER_L2:
714 case QED_CLUSTER_L1:
715 cb->status = 0;
716 break;
717 default:
718 assert(ret < 0);
719 cb->status = ret;
720 break;
721 }
722
723 if (cb->co) {
724 qemu_coroutine_enter(cb->co);
725 }
726}
727
728static int64_t coroutine_fn bdrv_qed_co_get_block_status(BlockDriverState *bs,
729 int64_t sector_num,
730 int nb_sectors, int *pnum,
731 BlockDriverState **file)
732{
733 BDRVQEDState *s = bs->opaque;
734 size_t len = (size_t)nb_sectors * BDRV_SECTOR_SIZE;
735 QEDIsAllocatedCB cb = {
736 .bs = bs,
737 .pos = (uint64_t)sector_num * BDRV_SECTOR_SIZE,
738 .status = BDRV_BLOCK_OFFSET_MASK,
739 .pnum = pnum,
740 .file = file,
741 };
742 QEDRequest request = { .l2_table = NULL };
743
744 qed_find_cluster(s, &request, cb.pos, len, qed_is_allocated_cb, &cb);
745
746
747 while (cb.status == BDRV_BLOCK_OFFSET_MASK) {
748 cb.co = qemu_coroutine_self();
749 qemu_coroutine_yield();
750 }
751
752 qed_unref_l2_cache_entry(request.l2_table);
753
754 return cb.status;
755}
756
757static BDRVQEDState *acb_to_s(QEDAIOCB *acb)
758{
759 return acb->common.bs->opaque;
760}
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775static void qed_read_backing_file(BDRVQEDState *s, uint64_t pos,
776 QEMUIOVector *qiov,
777 QEMUIOVector **backing_qiov,
778 BlockCompletionFunc *cb, void *opaque)
779{
780 uint64_t backing_length = 0;
781 size_t size;
782
783
784
785
786 if (s->bs->backing) {
787 int64_t l = bdrv_getlength(s->bs->backing->bs);
788 if (l < 0) {
789 cb(opaque, l);
790 return;
791 }
792 backing_length = l;
793 }
794
795
796 if (pos >= backing_length ||
797 pos + qiov->size > backing_length) {
798 qemu_iovec_memset(qiov, 0, 0, qiov->size);
799 }
800
801
802 if (pos >= backing_length) {
803 cb(opaque, 0);
804 return;
805 }
806
807
808 size = MIN((uint64_t)backing_length - pos, qiov->size);
809
810 assert(*backing_qiov == NULL);
811 *backing_qiov = g_new(QEMUIOVector, 1);
812 qemu_iovec_init(*backing_qiov, qiov->niov);
813 qemu_iovec_concat(*backing_qiov, qiov, 0, size);
814
815 BLKDBG_EVENT(s->bs->file, BLKDBG_READ_BACKING_AIO);
816 bdrv_aio_readv(s->bs->backing, pos / BDRV_SECTOR_SIZE,
817 *backing_qiov, size / BDRV_SECTOR_SIZE, cb, opaque);
818}
819
820typedef struct {
821 GenericCB gencb;
822 BDRVQEDState *s;
823 QEMUIOVector qiov;
824 QEMUIOVector *backing_qiov;
825 struct iovec iov;
826 uint64_t offset;
827} CopyFromBackingFileCB;
828
829static void qed_copy_from_backing_file_cb(void *opaque, int ret)
830{
831 CopyFromBackingFileCB *copy_cb = opaque;
832 qemu_vfree(copy_cb->iov.iov_base);
833 gencb_complete(©_cb->gencb, ret);
834}
835
836static void qed_copy_from_backing_file_write(void *opaque, int ret)
837{
838 CopyFromBackingFileCB *copy_cb = opaque;
839 BDRVQEDState *s = copy_cb->s;
840
841 if (copy_cb->backing_qiov) {
842 qemu_iovec_destroy(copy_cb->backing_qiov);
843 g_free(copy_cb->backing_qiov);
844 copy_cb->backing_qiov = NULL;
845 }
846
847 if (ret) {
848 qed_copy_from_backing_file_cb(copy_cb, ret);
849 return;
850 }
851
852 BLKDBG_EVENT(s->bs->file, BLKDBG_COW_WRITE);
853 bdrv_aio_writev(s->bs->file, copy_cb->offset / BDRV_SECTOR_SIZE,
854 ©_cb->qiov, copy_cb->qiov.size / BDRV_SECTOR_SIZE,
855 qed_copy_from_backing_file_cb, copy_cb);
856}
857
858
859
860
861
862
863
864
865
866
867
868static void qed_copy_from_backing_file(BDRVQEDState *s, uint64_t pos,
869 uint64_t len, uint64_t offset,
870 BlockCompletionFunc *cb,
871 void *opaque)
872{
873 CopyFromBackingFileCB *copy_cb;
874
875
876 if (len == 0) {
877 cb(opaque, 0);
878 return;
879 }
880
881 copy_cb = gencb_alloc(sizeof(*copy_cb), cb, opaque);
882 copy_cb->s = s;
883 copy_cb->offset = offset;
884 copy_cb->backing_qiov = NULL;
885 copy_cb->iov.iov_base = qemu_blockalign(s->bs, len);
886 copy_cb->iov.iov_len = len;
887 qemu_iovec_init_external(©_cb->qiov, ©_cb->iov, 1);
888
889 qed_read_backing_file(s, pos, ©_cb->qiov, ©_cb->backing_qiov,
890 qed_copy_from_backing_file_write, copy_cb);
891}
892
893
894
895
896
897
898
899
900
901
902
903
904
905static void qed_update_l2_table(BDRVQEDState *s, QEDTable *table, int index,
906 unsigned int n, uint64_t cluster)
907{
908 int i;
909 for (i = index; i < index + n; i++) {
910 table->offsets[i] = cluster;
911 if (!qed_offset_is_unalloc_cluster(cluster) &&
912 !qed_offset_is_zero_cluster(cluster)) {
913 cluster += s->header.cluster_size;
914 }
915 }
916}
917
918static void qed_aio_complete_bh(void *opaque)
919{
920 QEDAIOCB *acb = opaque;
921 BlockCompletionFunc *cb = acb->common.cb;
922 void *user_opaque = acb->common.opaque;
923 int ret = acb->bh_ret;
924
925 qemu_aio_unref(acb);
926
927
928 cb(user_opaque, ret);
929}
930
931static void qed_aio_complete(QEDAIOCB *acb, int ret)
932{
933 BDRVQEDState *s = acb_to_s(acb);
934
935 trace_qed_aio_complete(s, acb, ret);
936
937
938 qemu_iovec_destroy(&acb->cur_qiov);
939 qed_unref_l2_cache_entry(acb->request.l2_table);
940
941
942 if (acb->flags & QED_AIOCB_ZERO) {
943 qemu_vfree(acb->qiov->iov[0].iov_base);
944 acb->qiov->iov[0].iov_base = NULL;
945 }
946
947
948 acb->bh_ret = ret;
949 aio_bh_schedule_oneshot(bdrv_get_aio_context(acb->common.bs),
950 qed_aio_complete_bh, acb);
951
952
953
954
955
956
957
958 if (acb == QSIMPLEQ_FIRST(&s->allocating_write_reqs)) {
959 QSIMPLEQ_REMOVE_HEAD(&s->allocating_write_reqs, next);
960 acb = QSIMPLEQ_FIRST(&s->allocating_write_reqs);
961 if (acb) {
962 qed_aio_next_io(acb, 0);
963 } else if (s->header.features & QED_F_NEED_CHECK) {
964 qed_start_need_check_timer(s);
965 }
966 }
967}
968
969
970
971
972static void qed_commit_l2_update(void *opaque, int ret)
973{
974 QEDAIOCB *acb = opaque;
975 BDRVQEDState *s = acb_to_s(acb);
976 CachedL2Table *l2_table = acb->request.l2_table;
977 uint64_t l2_offset = l2_table->offset;
978
979 qed_commit_l2_cache_entry(&s->l2_cache, l2_table);
980
981
982
983
984 acb->request.l2_table = qed_find_l2_cache_entry(&s->l2_cache, l2_offset);
985 assert(acb->request.l2_table != NULL);
986
987 qed_aio_next_io(opaque, ret);
988}
989
990
991
992
993static void qed_aio_write_l1_update(void *opaque, int ret)
994{
995 QEDAIOCB *acb = opaque;
996 BDRVQEDState *s = acb_to_s(acb);
997 int index;
998
999 if (ret) {
1000 qed_aio_complete(acb, ret);
1001 return;
1002 }
1003
1004 index = qed_l1_index(s, acb->cur_pos);
1005 s->l1_table->offsets[index] = acb->request.l2_table->offset;
1006
1007 qed_write_l1_table(s, index, 1, qed_commit_l2_update, acb);
1008}
1009
1010
1011
1012
1013static void qed_aio_write_l2_update(QEDAIOCB *acb, int ret, uint64_t offset)
1014{
1015 BDRVQEDState *s = acb_to_s(acb);
1016 bool need_alloc = acb->find_cluster_ret == QED_CLUSTER_L1;
1017 int index;
1018
1019 if (ret) {
1020 goto err;
1021 }
1022
1023 if (need_alloc) {
1024 qed_unref_l2_cache_entry(acb->request.l2_table);
1025 acb->request.l2_table = qed_new_l2_table(s);
1026 }
1027
1028 index = qed_l2_index(s, acb->cur_pos);
1029 qed_update_l2_table(s, acb->request.l2_table->table, index, acb->cur_nclusters,
1030 offset);
1031
1032 if (need_alloc) {
1033
1034 qed_write_l2_table(s, &acb->request, 0, s->table_nelems, true,
1035 qed_aio_write_l1_update, acb);
1036 } else {
1037
1038 qed_write_l2_table(s, &acb->request, index, acb->cur_nclusters, false,
1039 qed_aio_next_io, acb);
1040 }
1041 return;
1042
1043err:
1044 qed_aio_complete(acb, ret);
1045}
1046
1047static void qed_aio_write_l2_update_cb(void *opaque, int ret)
1048{
1049 QEDAIOCB *acb = opaque;
1050 qed_aio_write_l2_update(acb, ret, acb->cur_cluster);
1051}
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062static void qed_aio_write_flush_before_l2_update(void *opaque, int ret)
1063{
1064 QEDAIOCB *acb = opaque;
1065 BDRVQEDState *s = acb_to_s(acb);
1066
1067 if (!bdrv_aio_flush(s->bs->file->bs, qed_aio_write_l2_update_cb, opaque)) {
1068 qed_aio_complete(acb, -EIO);
1069 }
1070}
1071
1072
1073
1074
1075static void qed_aio_write_main(void *opaque, int ret)
1076{
1077 QEDAIOCB *acb = opaque;
1078 BDRVQEDState *s = acb_to_s(acb);
1079 uint64_t offset = acb->cur_cluster +
1080 qed_offset_into_cluster(s, acb->cur_pos);
1081 BlockCompletionFunc *next_fn;
1082
1083 trace_qed_aio_write_main(s, acb, ret, offset, acb->cur_qiov.size);
1084
1085 if (ret) {
1086 qed_aio_complete(acb, ret);
1087 return;
1088 }
1089
1090 if (acb->find_cluster_ret == QED_CLUSTER_FOUND) {
1091 next_fn = qed_aio_next_io;
1092 } else {
1093 if (s->bs->backing) {
1094 next_fn = qed_aio_write_flush_before_l2_update;
1095 } else {
1096 next_fn = qed_aio_write_l2_update_cb;
1097 }
1098 }
1099
1100 BLKDBG_EVENT(s->bs->file, BLKDBG_WRITE_AIO);
1101 bdrv_aio_writev(s->bs->file, offset / BDRV_SECTOR_SIZE,
1102 &acb->cur_qiov, acb->cur_qiov.size / BDRV_SECTOR_SIZE,
1103 next_fn, acb);
1104}
1105
1106
1107
1108
1109static void qed_aio_write_postfill(void *opaque, int ret)
1110{
1111 QEDAIOCB *acb = opaque;
1112 BDRVQEDState *s = acb_to_s(acb);
1113 uint64_t start = acb->cur_pos + acb->cur_qiov.size;
1114 uint64_t len =
1115 qed_start_of_cluster(s, start + s->header.cluster_size - 1) - start;
1116 uint64_t offset = acb->cur_cluster +
1117 qed_offset_into_cluster(s, acb->cur_pos) +
1118 acb->cur_qiov.size;
1119
1120 if (ret) {
1121 qed_aio_complete(acb, ret);
1122 return;
1123 }
1124
1125 trace_qed_aio_write_postfill(s, acb, start, len, offset);
1126 qed_copy_from_backing_file(s, start, len, offset,
1127 qed_aio_write_main, acb);
1128}
1129
1130
1131
1132
1133static void qed_aio_write_prefill(void *opaque, int ret)
1134{
1135 QEDAIOCB *acb = opaque;
1136 BDRVQEDState *s = acb_to_s(acb);
1137 uint64_t start = qed_start_of_cluster(s, acb->cur_pos);
1138 uint64_t len = qed_offset_into_cluster(s, acb->cur_pos);
1139
1140 trace_qed_aio_write_prefill(s, acb, start, len, acb->cur_cluster);
1141 qed_copy_from_backing_file(s, start, len, acb->cur_cluster,
1142 qed_aio_write_postfill, acb);
1143}
1144
1145
1146
1147
1148static bool qed_should_set_need_check(BDRVQEDState *s)
1149{
1150
1151 if (s->bs->backing) {
1152 return false;
1153 }
1154
1155 return !(s->header.features & QED_F_NEED_CHECK);
1156}
1157
1158static void qed_aio_write_zero_cluster(void *opaque, int ret)
1159{
1160 QEDAIOCB *acb = opaque;
1161
1162 if (ret) {
1163 qed_aio_complete(acb, ret);
1164 return;
1165 }
1166
1167 qed_aio_write_l2_update(acb, 0, 1);
1168}
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178static void qed_aio_write_alloc(QEDAIOCB *acb, size_t len)
1179{
1180 BDRVQEDState *s = acb_to_s(acb);
1181 BlockCompletionFunc *cb;
1182
1183
1184 if (QSIMPLEQ_EMPTY(&s->allocating_write_reqs)) {
1185 qed_cancel_need_check_timer(s);
1186 }
1187
1188
1189 if (acb != QSIMPLEQ_FIRST(&s->allocating_write_reqs)) {
1190 QSIMPLEQ_INSERT_TAIL(&s->allocating_write_reqs, acb, next);
1191 }
1192 if (acb != QSIMPLEQ_FIRST(&s->allocating_write_reqs) ||
1193 s->allocating_write_reqs_plugged) {
1194 return;
1195 }
1196
1197 acb->cur_nclusters = qed_bytes_to_clusters(s,
1198 qed_offset_into_cluster(s, acb->cur_pos) + len);
1199 qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
1200
1201 if (acb->flags & QED_AIOCB_ZERO) {
1202
1203 if (acb->find_cluster_ret == QED_CLUSTER_ZERO) {
1204 qed_aio_next_io(acb, 0);
1205 return;
1206 }
1207
1208 cb = qed_aio_write_zero_cluster;
1209 } else {
1210 cb = qed_aio_write_prefill;
1211 acb->cur_cluster = qed_alloc_clusters(s, acb->cur_nclusters);
1212 }
1213
1214 if (qed_should_set_need_check(s)) {
1215 s->header.features |= QED_F_NEED_CHECK;
1216 qed_write_header(s, cb, acb);
1217 } else {
1218 cb(acb, 0);
1219 }
1220}
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231static void qed_aio_write_inplace(QEDAIOCB *acb, uint64_t offset, size_t len)
1232{
1233
1234 if (acb->flags & QED_AIOCB_ZERO) {
1235 struct iovec *iov = acb->qiov->iov;
1236
1237 if (!iov->iov_base) {
1238 iov->iov_base = qemu_try_blockalign(acb->common.bs, iov->iov_len);
1239 if (iov->iov_base == NULL) {
1240 qed_aio_complete(acb, -ENOMEM);
1241 return;
1242 }
1243 memset(iov->iov_base, 0, iov->iov_len);
1244 }
1245 }
1246
1247
1248 acb->cur_cluster = offset;
1249 qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
1250
1251
1252 qed_aio_write_main(acb, 0);
1253}
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266static void qed_aio_write_data(void *opaque, int ret,
1267 uint64_t offset, size_t len)
1268{
1269 QEDAIOCB *acb = opaque;
1270
1271 trace_qed_aio_write_data(acb_to_s(acb), acb, ret, offset, len);
1272
1273 acb->find_cluster_ret = ret;
1274
1275 switch (ret) {
1276 case QED_CLUSTER_FOUND:
1277 qed_aio_write_inplace(acb, offset, len);
1278 break;
1279
1280 case QED_CLUSTER_L2:
1281 case QED_CLUSTER_L1:
1282 case QED_CLUSTER_ZERO:
1283 qed_aio_write_alloc(acb, len);
1284 break;
1285
1286 default:
1287 qed_aio_complete(acb, ret);
1288 break;
1289 }
1290}
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303static void qed_aio_read_data(void *opaque, int ret,
1304 uint64_t offset, size_t len)
1305{
1306 QEDAIOCB *acb = opaque;
1307 BDRVQEDState *s = acb_to_s(acb);
1308 BlockDriverState *bs = acb->common.bs;
1309
1310
1311 offset += qed_offset_into_cluster(s, acb->cur_pos);
1312
1313 trace_qed_aio_read_data(s, acb, ret, offset, len);
1314
1315 if (ret < 0) {
1316 goto err;
1317 }
1318
1319 qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
1320
1321
1322 if (ret == QED_CLUSTER_ZERO) {
1323 qemu_iovec_memset(&acb->cur_qiov, 0, 0, acb->cur_qiov.size);
1324 qed_aio_next_io(acb, 0);
1325 return;
1326 } else if (ret != QED_CLUSTER_FOUND) {
1327 qed_read_backing_file(s, acb->cur_pos, &acb->cur_qiov,
1328 &acb->backing_qiov, qed_aio_next_io, acb);
1329 return;
1330 }
1331
1332 BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
1333 bdrv_aio_readv(bs->file, offset / BDRV_SECTOR_SIZE,
1334 &acb->cur_qiov, acb->cur_qiov.size / BDRV_SECTOR_SIZE,
1335 qed_aio_next_io, acb);
1336 return;
1337
1338err:
1339 qed_aio_complete(acb, ret);
1340}
1341
1342
1343
1344
1345static void qed_aio_next_io(void *opaque, int ret)
1346{
1347 QEDAIOCB *acb = opaque;
1348 BDRVQEDState *s = acb_to_s(acb);
1349 QEDFindClusterFunc *io_fn = (acb->flags & QED_AIOCB_WRITE) ?
1350 qed_aio_write_data : qed_aio_read_data;
1351
1352 trace_qed_aio_next_io(s, acb, ret, acb->cur_pos + acb->cur_qiov.size);
1353
1354 if (acb->backing_qiov) {
1355 qemu_iovec_destroy(acb->backing_qiov);
1356 g_free(acb->backing_qiov);
1357 acb->backing_qiov = NULL;
1358 }
1359
1360
1361 if (ret) {
1362 qed_aio_complete(acb, ret);
1363 return;
1364 }
1365
1366 acb->qiov_offset += acb->cur_qiov.size;
1367 acb->cur_pos += acb->cur_qiov.size;
1368 qemu_iovec_reset(&acb->cur_qiov);
1369
1370
1371 if (acb->cur_pos >= acb->end_pos) {
1372 qed_aio_complete(acb, 0);
1373 return;
1374 }
1375
1376
1377 qed_find_cluster(s, &acb->request,
1378 acb->cur_pos, acb->end_pos - acb->cur_pos,
1379 io_fn, acb);
1380}
1381
1382static BlockAIOCB *qed_aio_setup(BlockDriverState *bs,
1383 int64_t sector_num,
1384 QEMUIOVector *qiov, int nb_sectors,
1385 BlockCompletionFunc *cb,
1386 void *opaque, int flags)
1387{
1388 QEDAIOCB *acb = qemu_aio_get(&qed_aiocb_info, bs, cb, opaque);
1389
1390 trace_qed_aio_setup(bs->opaque, acb, sector_num, nb_sectors,
1391 opaque, flags);
1392
1393 acb->flags = flags;
1394 acb->qiov = qiov;
1395 acb->qiov_offset = 0;
1396 acb->cur_pos = (uint64_t)sector_num * BDRV_SECTOR_SIZE;
1397 acb->end_pos = acb->cur_pos + nb_sectors * BDRV_SECTOR_SIZE;
1398 acb->backing_qiov = NULL;
1399 acb->request.l2_table = NULL;
1400 qemu_iovec_init(&acb->cur_qiov, qiov->niov);
1401
1402
1403 qed_aio_next_io(acb, 0);
1404 return &acb->common;
1405}
1406
1407static BlockAIOCB *bdrv_qed_aio_readv(BlockDriverState *bs,
1408 int64_t sector_num,
1409 QEMUIOVector *qiov, int nb_sectors,
1410 BlockCompletionFunc *cb,
1411 void *opaque)
1412{
1413 return qed_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
1414}
1415
1416static BlockAIOCB *bdrv_qed_aio_writev(BlockDriverState *bs,
1417 int64_t sector_num,
1418 QEMUIOVector *qiov, int nb_sectors,
1419 BlockCompletionFunc *cb,
1420 void *opaque)
1421{
1422 return qed_aio_setup(bs, sector_num, qiov, nb_sectors, cb,
1423 opaque, QED_AIOCB_WRITE);
1424}
1425
1426typedef struct {
1427 Coroutine *co;
1428 int ret;
1429 bool done;
1430} QEDWriteZeroesCB;
1431
1432static void coroutine_fn qed_co_pwrite_zeroes_cb(void *opaque, int ret)
1433{
1434 QEDWriteZeroesCB *cb = opaque;
1435
1436 cb->done = true;
1437 cb->ret = ret;
1438 if (cb->co) {
1439 qemu_coroutine_enter(cb->co);
1440 }
1441}
1442
1443static int coroutine_fn bdrv_qed_co_pwrite_zeroes(BlockDriverState *bs,
1444 int64_t offset,
1445 int count,
1446 BdrvRequestFlags flags)
1447{
1448 BlockAIOCB *blockacb;
1449 BDRVQEDState *s = bs->opaque;
1450 QEDWriteZeroesCB cb = { .done = false };
1451 QEMUIOVector qiov;
1452 struct iovec iov;
1453
1454
1455 if (qed_offset_into_cluster(s, offset) ||
1456 qed_offset_into_cluster(s, count)) {
1457 return -ENOTSUP;
1458 }
1459
1460
1461
1462
1463 iov.iov_base = NULL;
1464 iov.iov_len = count;
1465
1466 qemu_iovec_init_external(&qiov, &iov, 1);
1467 blockacb = qed_aio_setup(bs, offset >> BDRV_SECTOR_BITS, &qiov,
1468 count >> BDRV_SECTOR_BITS,
1469 qed_co_pwrite_zeroes_cb, &cb,
1470 QED_AIOCB_WRITE | QED_AIOCB_ZERO);
1471 if (!blockacb) {
1472 return -EIO;
1473 }
1474 if (!cb.done) {
1475 cb.co = qemu_coroutine_self();
1476 qemu_coroutine_yield();
1477 }
1478 assert(cb.done);
1479 return cb.ret;
1480}
1481
1482static int bdrv_qed_truncate(BlockDriverState *bs, int64_t offset)
1483{
1484 BDRVQEDState *s = bs->opaque;
1485 uint64_t old_image_size;
1486 int ret;
1487
1488 if (!qed_is_image_size_valid(offset, s->header.cluster_size,
1489 s->header.table_size)) {
1490 return -EINVAL;
1491 }
1492
1493
1494 if ((uint64_t)offset < s->header.image_size) {
1495 return -ENOTSUP;
1496 }
1497
1498 old_image_size = s->header.image_size;
1499 s->header.image_size = offset;
1500 ret = qed_write_header_sync(s);
1501 if (ret < 0) {
1502 s->header.image_size = old_image_size;
1503 }
1504 return ret;
1505}
1506
1507static int64_t bdrv_qed_getlength(BlockDriverState *bs)
1508{
1509 BDRVQEDState *s = bs->opaque;
1510 return s->header.image_size;
1511}
1512
1513static int bdrv_qed_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1514{
1515 BDRVQEDState *s = bs->opaque;
1516
1517 memset(bdi, 0, sizeof(*bdi));
1518 bdi->cluster_size = s->header.cluster_size;
1519 bdi->is_dirty = s->header.features & QED_F_NEED_CHECK;
1520 bdi->unallocated_blocks_are_zero = true;
1521 bdi->can_write_zeroes_with_unmap = true;
1522 return 0;
1523}
1524
1525static int bdrv_qed_change_backing_file(BlockDriverState *bs,
1526 const char *backing_file,
1527 const char *backing_fmt)
1528{
1529 BDRVQEDState *s = bs->opaque;
1530 QEDHeader new_header, le_header;
1531 void *buffer;
1532 size_t buffer_len, backing_file_len;
1533 int ret;
1534
1535
1536
1537
1538
1539
1540 if (backing_file && (s->header.compat_features &
1541 ~QED_COMPAT_FEATURE_MASK)) {
1542 return -ENOTSUP;
1543 }
1544
1545 memcpy(&new_header, &s->header, sizeof(new_header));
1546
1547 new_header.features &= ~(QED_F_BACKING_FILE |
1548 QED_F_BACKING_FORMAT_NO_PROBE);
1549
1550
1551 if (backing_file) {
1552 new_header.features |= QED_F_BACKING_FILE;
1553
1554 if (qed_fmt_is_raw(backing_fmt)) {
1555 new_header.features |= QED_F_BACKING_FORMAT_NO_PROBE;
1556 }
1557 }
1558
1559
1560 backing_file_len = 0;
1561
1562 if (backing_file) {
1563 backing_file_len = strlen(backing_file);
1564 }
1565
1566 buffer_len = sizeof(new_header);
1567 new_header.backing_filename_offset = buffer_len;
1568 new_header.backing_filename_size = backing_file_len;
1569 buffer_len += backing_file_len;
1570
1571
1572 if (buffer_len > new_header.header_size * new_header.cluster_size) {
1573 return -ENOSPC;
1574 }
1575
1576
1577 buffer = g_malloc(buffer_len);
1578
1579 qed_header_cpu_to_le(&new_header, &le_header);
1580 memcpy(buffer, &le_header, sizeof(le_header));
1581 buffer_len = sizeof(le_header);
1582
1583 if (backing_file) {
1584 memcpy(buffer + buffer_len, backing_file, backing_file_len);
1585 buffer_len += backing_file_len;
1586 }
1587
1588
1589 ret = bdrv_pwrite_sync(bs->file, 0, buffer, buffer_len);
1590 g_free(buffer);
1591 if (ret == 0) {
1592 memcpy(&s->header, &new_header, sizeof(new_header));
1593 }
1594 return ret;
1595}
1596
1597static void bdrv_qed_invalidate_cache(BlockDriverState *bs, Error **errp)
1598{
1599 BDRVQEDState *s = bs->opaque;
1600 Error *local_err = NULL;
1601 int ret;
1602
1603 bdrv_qed_close(bs);
1604
1605 memset(s, 0, sizeof(BDRVQEDState));
1606 ret = bdrv_qed_open(bs, NULL, bs->open_flags, &local_err);
1607 if (local_err) {
1608 error_propagate(errp, local_err);
1609 error_prepend(errp, "Could not reopen qed layer: ");
1610 return;
1611 } else if (ret < 0) {
1612 error_setg_errno(errp, -ret, "Could not reopen qed layer");
1613 return;
1614 }
1615}
1616
1617static int bdrv_qed_check(BlockDriverState *bs, BdrvCheckResult *result,
1618 BdrvCheckMode fix)
1619{
1620 BDRVQEDState *s = bs->opaque;
1621
1622 return qed_check(s, result, !!fix);
1623}
1624
1625static QemuOptsList qed_create_opts = {
1626 .name = "qed-create-opts",
1627 .head = QTAILQ_HEAD_INITIALIZER(qed_create_opts.head),
1628 .desc = {
1629 {
1630 .name = BLOCK_OPT_SIZE,
1631 .type = QEMU_OPT_SIZE,
1632 .help = "Virtual disk size"
1633 },
1634 {
1635 .name = BLOCK_OPT_BACKING_FILE,
1636 .type = QEMU_OPT_STRING,
1637 .help = "File name of a base image"
1638 },
1639 {
1640 .name = BLOCK_OPT_BACKING_FMT,
1641 .type = QEMU_OPT_STRING,
1642 .help = "Image format of the base image"
1643 },
1644 {
1645 .name = BLOCK_OPT_CLUSTER_SIZE,
1646 .type = QEMU_OPT_SIZE,
1647 .help = "Cluster size (in bytes)",
1648 .def_value_str = stringify(QED_DEFAULT_CLUSTER_SIZE)
1649 },
1650 {
1651 .name = BLOCK_OPT_TABLE_SIZE,
1652 .type = QEMU_OPT_SIZE,
1653 .help = "L1/L2 table size (in clusters)"
1654 },
1655 { }
1656 }
1657};
1658
1659static BlockDriver bdrv_qed = {
1660 .format_name = "qed",
1661 .instance_size = sizeof(BDRVQEDState),
1662 .create_opts = &qed_create_opts,
1663 .supports_backing = true,
1664
1665 .bdrv_probe = bdrv_qed_probe,
1666 .bdrv_open = bdrv_qed_open,
1667 .bdrv_close = bdrv_qed_close,
1668 .bdrv_reopen_prepare = bdrv_qed_reopen_prepare,
1669 .bdrv_create = bdrv_qed_create,
1670 .bdrv_has_zero_init = bdrv_has_zero_init_1,
1671 .bdrv_co_get_block_status = bdrv_qed_co_get_block_status,
1672 .bdrv_aio_readv = bdrv_qed_aio_readv,
1673 .bdrv_aio_writev = bdrv_qed_aio_writev,
1674 .bdrv_co_pwrite_zeroes = bdrv_qed_co_pwrite_zeroes,
1675 .bdrv_truncate = bdrv_qed_truncate,
1676 .bdrv_getlength = bdrv_qed_getlength,
1677 .bdrv_get_info = bdrv_qed_get_info,
1678 .bdrv_refresh_limits = bdrv_qed_refresh_limits,
1679 .bdrv_change_backing_file = bdrv_qed_change_backing_file,
1680 .bdrv_invalidate_cache = bdrv_qed_invalidate_cache,
1681 .bdrv_check = bdrv_qed_check,
1682 .bdrv_detach_aio_context = bdrv_qed_detach_aio_context,
1683 .bdrv_attach_aio_context = bdrv_qed_attach_aio_context,
1684 .bdrv_drain = bdrv_qed_drain,
1685};
1686
1687static void bdrv_qed_init(void)
1688{
1689 bdrv_register(&bdrv_qed);
1690}
1691
1692block_init(bdrv_qed_init);
1693