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52#include "qemu/osdep.h"
53#include "qemu/units.h"
54#include "qapi/error.h"
55#include "qapi/qobject-input-visitor.h"
56#include "qapi/qapi-visit-block-core.h"
57#include "block/block_int.h"
58#include "block/qdict.h"
59#include "sysemu/block-backend.h"
60#include "qemu/module.h"
61#include "qemu/option.h"
62#include "qemu/bswap.h"
63#include "migration/blocker.h"
64#include "qemu/coroutine.h"
65#include "qemu/cutils.h"
66#include "qemu/uuid.h"
67
68
69
70
71
72
73
74#define CONFIG_VDI_WRITE
75
76
77
78
79
80
81
82#define CONFIG_VDI_STATIC_IMAGE
83
84
85#define BLOCK_OPT_STATIC "static"
86
87#define SECTOR_SIZE 512
88#define DEFAULT_CLUSTER_SIZE 1048576
89
90
91#if defined(CONFIG_VDI_DEBUG)
92#define VDI_DEBUG 1
93#else
94#define VDI_DEBUG 0
95#endif
96
97#define logout(fmt, ...) \
98 do { \
99 if (VDI_DEBUG) { \
100 fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__); \
101 } \
102 } while (0)
103
104
105#define VDI_SIGNATURE 0xbeda107f
106
107
108#define VDI_VERSION_1_1 0x00010001
109
110
111#define VDI_TYPE_DYNAMIC 1
112#define VDI_TYPE_STATIC 2
113
114
115
116
117
118
119
120#define VDI_TEXT "<<< QEMU VM Virtual Disk Image >>>\n"
121
122
123#define VDI_UNALLOCATED 0xffffffffU
124
125
126#define VDI_DISCARDED 0xfffffffeU
127
128#define VDI_IS_ALLOCATED(X) ((X) < VDI_DISCARDED)
129
130
131
132
133
134
135
136
137
138
139
140#define VDI_BLOCKS_IN_IMAGE_MAX \
141 ((unsigned)((INT_MAX + 1u - BDRV_SECTOR_SIZE) / sizeof(uint32_t)))
142#define VDI_DISK_SIZE_MAX ((uint64_t)VDI_BLOCKS_IN_IMAGE_MAX * \
143 (uint64_t)DEFAULT_CLUSTER_SIZE)
144
145static QemuOptsList vdi_create_opts;
146
147typedef struct {
148 char text[0x40];
149 uint32_t signature;
150 uint32_t version;
151 uint32_t header_size;
152 uint32_t image_type;
153 uint32_t image_flags;
154 char description[256];
155 uint32_t offset_bmap;
156 uint32_t offset_data;
157 uint32_t cylinders;
158 uint32_t heads;
159 uint32_t sectors;
160 uint32_t sector_size;
161 uint32_t unused1;
162 uint64_t disk_size;
163 uint32_t block_size;
164 uint32_t block_extra;
165 uint32_t blocks_in_image;
166 uint32_t blocks_allocated;
167 QemuUUID uuid_image;
168 QemuUUID uuid_last_snap;
169 QemuUUID uuid_link;
170 QemuUUID uuid_parent;
171 uint64_t unused2[7];
172} QEMU_PACKED VdiHeader;
173
174QEMU_BUILD_BUG_ON(sizeof(VdiHeader) != 512);
175
176typedef struct {
177
178 uint32_t *bmap;
179
180 uint32_t block_size;
181
182 uint32_t bmap_sector;
183
184 VdiHeader header;
185
186 CoRwlock bmap_lock;
187
188 Error *migration_blocker;
189} BDRVVdiState;
190
191static void vdi_header_to_cpu(VdiHeader *header)
192{
193 header->signature = le32_to_cpu(header->signature);
194 header->version = le32_to_cpu(header->version);
195 header->header_size = le32_to_cpu(header->header_size);
196 header->image_type = le32_to_cpu(header->image_type);
197 header->image_flags = le32_to_cpu(header->image_flags);
198 header->offset_bmap = le32_to_cpu(header->offset_bmap);
199 header->offset_data = le32_to_cpu(header->offset_data);
200 header->cylinders = le32_to_cpu(header->cylinders);
201 header->heads = le32_to_cpu(header->heads);
202 header->sectors = le32_to_cpu(header->sectors);
203 header->sector_size = le32_to_cpu(header->sector_size);
204 header->disk_size = le64_to_cpu(header->disk_size);
205 header->block_size = le32_to_cpu(header->block_size);
206 header->block_extra = le32_to_cpu(header->block_extra);
207 header->blocks_in_image = le32_to_cpu(header->blocks_in_image);
208 header->blocks_allocated = le32_to_cpu(header->blocks_allocated);
209 header->uuid_image = qemu_uuid_bswap(header->uuid_image);
210 header->uuid_last_snap = qemu_uuid_bswap(header->uuid_last_snap);
211 header->uuid_link = qemu_uuid_bswap(header->uuid_link);
212 header->uuid_parent = qemu_uuid_bswap(header->uuid_parent);
213}
214
215static void vdi_header_to_le(VdiHeader *header)
216{
217 header->signature = cpu_to_le32(header->signature);
218 header->version = cpu_to_le32(header->version);
219 header->header_size = cpu_to_le32(header->header_size);
220 header->image_type = cpu_to_le32(header->image_type);
221 header->image_flags = cpu_to_le32(header->image_flags);
222 header->offset_bmap = cpu_to_le32(header->offset_bmap);
223 header->offset_data = cpu_to_le32(header->offset_data);
224 header->cylinders = cpu_to_le32(header->cylinders);
225 header->heads = cpu_to_le32(header->heads);
226 header->sectors = cpu_to_le32(header->sectors);
227 header->sector_size = cpu_to_le32(header->sector_size);
228 header->disk_size = cpu_to_le64(header->disk_size);
229 header->block_size = cpu_to_le32(header->block_size);
230 header->block_extra = cpu_to_le32(header->block_extra);
231 header->blocks_in_image = cpu_to_le32(header->blocks_in_image);
232 header->blocks_allocated = cpu_to_le32(header->blocks_allocated);
233 header->uuid_image = qemu_uuid_bswap(header->uuid_image);
234 header->uuid_last_snap = qemu_uuid_bswap(header->uuid_last_snap);
235 header->uuid_link = qemu_uuid_bswap(header->uuid_link);
236 header->uuid_parent = qemu_uuid_bswap(header->uuid_parent);
237}
238
239static void vdi_header_print(VdiHeader *header)
240{
241 char uuidstr[37];
242 QemuUUID uuid;
243 logout("text %s", header->text);
244 logout("signature 0x%08x\n", header->signature);
245 logout("header size 0x%04x\n", header->header_size);
246 logout("image type 0x%04x\n", header->image_type);
247 logout("image flags 0x%04x\n", header->image_flags);
248 logout("description %s\n", header->description);
249 logout("offset bmap 0x%04x\n", header->offset_bmap);
250 logout("offset data 0x%04x\n", header->offset_data);
251 logout("cylinders 0x%04x\n", header->cylinders);
252 logout("heads 0x%04x\n", header->heads);
253 logout("sectors 0x%04x\n", header->sectors);
254 logout("sector size 0x%04x\n", header->sector_size);
255 logout("image size 0x%" PRIx64 " B (%" PRIu64 " MiB)\n",
256 header->disk_size, header->disk_size / MiB);
257 logout("block size 0x%04x\n", header->block_size);
258 logout("block extra 0x%04x\n", header->block_extra);
259 logout("blocks tot. 0x%04x\n", header->blocks_in_image);
260 logout("blocks all. 0x%04x\n", header->blocks_allocated);
261 uuid = header->uuid_image;
262 qemu_uuid_unparse(&uuid, uuidstr);
263 logout("uuid image %s\n", uuidstr);
264 uuid = header->uuid_last_snap;
265 qemu_uuid_unparse(&uuid, uuidstr);
266 logout("uuid snap %s\n", uuidstr);
267 uuid = header->uuid_link;
268 qemu_uuid_unparse(&uuid, uuidstr);
269 logout("uuid link %s\n", uuidstr);
270 uuid = header->uuid_parent;
271 qemu_uuid_unparse(&uuid, uuidstr);
272 logout("uuid parent %s\n", uuidstr);
273}
274
275static int coroutine_fn vdi_co_check(BlockDriverState *bs, BdrvCheckResult *res,
276 BdrvCheckMode fix)
277{
278
279 BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
280 uint32_t blocks_allocated = 0;
281 uint32_t block;
282 uint32_t *bmap;
283 logout("\n");
284
285 if (fix) {
286 return -ENOTSUP;
287 }
288
289 bmap = g_try_new(uint32_t, s->header.blocks_in_image);
290 if (s->header.blocks_in_image && bmap == NULL) {
291 res->check_errors++;
292 return -ENOMEM;
293 }
294
295 memset(bmap, 0xff, s->header.blocks_in_image * sizeof(uint32_t));
296
297
298 for (block = 0; block < s->header.blocks_in_image; block++) {
299 uint32_t bmap_entry = le32_to_cpu(s->bmap[block]);
300 if (VDI_IS_ALLOCATED(bmap_entry)) {
301 if (bmap_entry < s->header.blocks_in_image) {
302 blocks_allocated++;
303 if (!VDI_IS_ALLOCATED(bmap[bmap_entry])) {
304 bmap[bmap_entry] = bmap_entry;
305 } else {
306 fprintf(stderr, "ERROR: block index %" PRIu32
307 " also used by %" PRIu32 "\n", bmap[bmap_entry], bmap_entry);
308 res->corruptions++;
309 }
310 } else {
311 fprintf(stderr, "ERROR: block index %" PRIu32
312 " too large, is %" PRIu32 "\n", block, bmap_entry);
313 res->corruptions++;
314 }
315 }
316 }
317 if (blocks_allocated != s->header.blocks_allocated) {
318 fprintf(stderr, "ERROR: allocated blocks mismatch, is %" PRIu32
319 ", should be %" PRIu32 "\n",
320 blocks_allocated, s->header.blocks_allocated);
321 res->corruptions++;
322 }
323
324 g_free(bmap);
325
326 return 0;
327}
328
329static int vdi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
330{
331
332
333 BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
334 logout("\n");
335 bdi->cluster_size = s->block_size;
336 bdi->vm_state_offset = 0;
337 bdi->unallocated_blocks_are_zero = true;
338 return 0;
339}
340
341static int vdi_make_empty(BlockDriverState *bs)
342{
343
344 logout("\n");
345
346 return 0;
347}
348
349static int vdi_probe(const uint8_t *buf, int buf_size, const char *filename)
350{
351 const VdiHeader *header = (const VdiHeader *)buf;
352 int ret = 0;
353
354 logout("\n");
355
356 if (buf_size < sizeof(*header)) {
357
358 } else if (le32_to_cpu(header->signature) == VDI_SIGNATURE) {
359 ret = 100;
360 }
361
362 if (ret == 0) {
363 logout("no vdi image\n");
364 } else {
365 logout("%s", header->text);
366 }
367
368 return ret;
369}
370
371static int vdi_open(BlockDriverState *bs, QDict *options, int flags,
372 Error **errp)
373{
374 BDRVVdiState *s = bs->opaque;
375 VdiHeader header;
376 size_t bmap_size;
377 int ret;
378 Error *local_err = NULL;
379 QemuUUID uuid_link, uuid_parent;
380
381 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
382 false, errp);
383 if (!bs->file) {
384 return -EINVAL;
385 }
386
387 logout("\n");
388
389 ret = bdrv_pread(bs->file, 0, &header, sizeof(header));
390 if (ret < 0) {
391 goto fail;
392 }
393
394 vdi_header_to_cpu(&header);
395 if (VDI_DEBUG) {
396 vdi_header_print(&header);
397 }
398
399 if (header.disk_size > VDI_DISK_SIZE_MAX) {
400 error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64
401 ", max supported is 0x%" PRIx64 ")",
402 header.disk_size, VDI_DISK_SIZE_MAX);
403 ret = -ENOTSUP;
404 goto fail;
405 }
406
407 uuid_link = header.uuid_link;
408 uuid_parent = header.uuid_parent;
409
410 if (header.disk_size % SECTOR_SIZE != 0) {
411
412
413
414 logout("odd disk size %" PRIu64 " B, round up\n", header.disk_size);
415 header.disk_size = ROUND_UP(header.disk_size, SECTOR_SIZE);
416 }
417
418 if (header.signature != VDI_SIGNATURE) {
419 error_setg(errp, "Image not in VDI format (bad signature %08" PRIx32
420 ")", header.signature);
421 ret = -EINVAL;
422 goto fail;
423 } else if (header.version != VDI_VERSION_1_1) {
424 error_setg(errp, "unsupported VDI image (version %" PRIu32 ".%" PRIu32
425 ")", header.version >> 16, header.version & 0xffff);
426 ret = -ENOTSUP;
427 goto fail;
428 } else if (header.offset_bmap % SECTOR_SIZE != 0) {
429
430 error_setg(errp, "unsupported VDI image (unaligned block map offset "
431 "0x%" PRIx32 ")", header.offset_bmap);
432 ret = -ENOTSUP;
433 goto fail;
434 } else if (header.offset_data % SECTOR_SIZE != 0) {
435
436 error_setg(errp, "unsupported VDI image (unaligned data offset 0x%"
437 PRIx32 ")", header.offset_data);
438 ret = -ENOTSUP;
439 goto fail;
440 } else if (header.sector_size != SECTOR_SIZE) {
441 error_setg(errp, "unsupported VDI image (sector size %" PRIu32
442 " is not %u)", header.sector_size, SECTOR_SIZE);
443 ret = -ENOTSUP;
444 goto fail;
445 } else if (header.block_size != DEFAULT_CLUSTER_SIZE) {
446 error_setg(errp, "unsupported VDI image (block size %" PRIu32
447 " is not %" PRIu32 ")",
448 header.block_size, DEFAULT_CLUSTER_SIZE);
449 ret = -ENOTSUP;
450 goto fail;
451 } else if (header.disk_size >
452 (uint64_t)header.blocks_in_image * header.block_size) {
453 error_setg(errp, "unsupported VDI image (disk size %" PRIu64 ", "
454 "image bitmap has room for %" PRIu64 ")",
455 header.disk_size,
456 (uint64_t)header.blocks_in_image * header.block_size);
457 ret = -ENOTSUP;
458 goto fail;
459 } else if (!qemu_uuid_is_null(&uuid_link)) {
460 error_setg(errp, "unsupported VDI image (non-NULL link UUID)");
461 ret = -ENOTSUP;
462 goto fail;
463 } else if (!qemu_uuid_is_null(&uuid_parent)) {
464 error_setg(errp, "unsupported VDI image (non-NULL parent UUID)");
465 ret = -ENOTSUP;
466 goto fail;
467 } else if (header.blocks_in_image > VDI_BLOCKS_IN_IMAGE_MAX) {
468 error_setg(errp, "unsupported VDI image "
469 "(too many blocks %u, max is %u)",
470 header.blocks_in_image, VDI_BLOCKS_IN_IMAGE_MAX);
471 ret = -ENOTSUP;
472 goto fail;
473 }
474
475 bs->total_sectors = header.disk_size / SECTOR_SIZE;
476
477 s->block_size = header.block_size;
478 s->bmap_sector = header.offset_bmap / SECTOR_SIZE;
479 s->header = header;
480
481 bmap_size = header.blocks_in_image * sizeof(uint32_t);
482 bmap_size = DIV_ROUND_UP(bmap_size, SECTOR_SIZE);
483 s->bmap = qemu_try_blockalign(bs->file->bs, bmap_size * SECTOR_SIZE);
484 if (s->bmap == NULL) {
485 ret = -ENOMEM;
486 goto fail;
487 }
488
489 ret = bdrv_pread(bs->file, header.offset_bmap, s->bmap,
490 bmap_size * SECTOR_SIZE);
491 if (ret < 0) {
492 goto fail_free_bmap;
493 }
494
495
496 error_setg(&s->migration_blocker, "The vdi format used by node '%s' "
497 "does not support live migration",
498 bdrv_get_device_or_node_name(bs));
499 ret = migrate_add_blocker(s->migration_blocker, &local_err);
500 if (local_err) {
501 error_propagate(errp, local_err);
502 error_free(s->migration_blocker);
503 goto fail_free_bmap;
504 }
505
506 qemu_co_rwlock_init(&s->bmap_lock);
507
508 return 0;
509
510 fail_free_bmap:
511 qemu_vfree(s->bmap);
512
513 fail:
514 return ret;
515}
516
517static int vdi_reopen_prepare(BDRVReopenState *state,
518 BlockReopenQueue *queue, Error **errp)
519{
520 return 0;
521}
522
523static int coroutine_fn vdi_co_block_status(BlockDriverState *bs,
524 bool want_zero,
525 int64_t offset, int64_t bytes,
526 int64_t *pnum, int64_t *map,
527 BlockDriverState **file)
528{
529 BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
530 size_t bmap_index = offset / s->block_size;
531 size_t index_in_block = offset % s->block_size;
532 uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]);
533 int result;
534
535 logout("%p, %" PRId64 ", %" PRId64 ", %p\n", bs, offset, bytes, pnum);
536 *pnum = MIN(s->block_size - index_in_block, bytes);
537 result = VDI_IS_ALLOCATED(bmap_entry);
538 if (!result) {
539 return 0;
540 }
541
542 *map = s->header.offset_data + (uint64_t)bmap_entry * s->block_size +
543 index_in_block;
544 *file = bs->file->bs;
545 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
546}
547
548static int coroutine_fn
549vdi_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
550 QEMUIOVector *qiov, int flags)
551{
552 BDRVVdiState *s = bs->opaque;
553 QEMUIOVector local_qiov;
554 uint32_t bmap_entry;
555 uint32_t block_index;
556 uint32_t offset_in_block;
557 uint32_t n_bytes;
558 uint64_t bytes_done = 0;
559 int ret = 0;
560
561 logout("\n");
562
563 qemu_iovec_init(&local_qiov, qiov->niov);
564
565 while (ret >= 0 && bytes > 0) {
566 block_index = offset / s->block_size;
567 offset_in_block = offset % s->block_size;
568 n_bytes = MIN(bytes, s->block_size - offset_in_block);
569
570 logout("will read %u bytes starting at offset %" PRIu64 "\n",
571 n_bytes, offset);
572
573
574 qemu_co_rwlock_rdlock(&s->bmap_lock);
575 bmap_entry = le32_to_cpu(s->bmap[block_index]);
576 qemu_co_rwlock_unlock(&s->bmap_lock);
577 if (!VDI_IS_ALLOCATED(bmap_entry)) {
578
579 qemu_iovec_memset(qiov, bytes_done, 0, n_bytes);
580 ret = 0;
581 } else {
582 uint64_t data_offset = s->header.offset_data +
583 (uint64_t)bmap_entry * s->block_size +
584 offset_in_block;
585
586 qemu_iovec_reset(&local_qiov);
587 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
588
589 ret = bdrv_co_preadv(bs->file, data_offset, n_bytes,
590 &local_qiov, 0);
591 }
592 logout("%u bytes read\n", n_bytes);
593
594 bytes -= n_bytes;
595 offset += n_bytes;
596 bytes_done += n_bytes;
597 }
598
599 qemu_iovec_destroy(&local_qiov);
600
601 return ret;
602}
603
604static int coroutine_fn
605vdi_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
606 QEMUIOVector *qiov, int flags)
607{
608 BDRVVdiState *s = bs->opaque;
609 QEMUIOVector local_qiov;
610 uint32_t bmap_entry;
611 uint32_t block_index;
612 uint32_t offset_in_block;
613 uint32_t n_bytes;
614 uint64_t data_offset;
615 uint32_t bmap_first = VDI_UNALLOCATED;
616 uint32_t bmap_last = VDI_UNALLOCATED;
617 uint8_t *block = NULL;
618 uint64_t bytes_done = 0;
619 int ret = 0;
620
621 logout("\n");
622
623 qemu_iovec_init(&local_qiov, qiov->niov);
624
625 while (ret >= 0 && bytes > 0) {
626 block_index = offset / s->block_size;
627 offset_in_block = offset % s->block_size;
628 n_bytes = MIN(bytes, s->block_size - offset_in_block);
629
630 logout("will write %u bytes starting at offset %" PRIu64 "\n",
631 n_bytes, offset);
632
633
634 qemu_co_rwlock_rdlock(&s->bmap_lock);
635 bmap_entry = le32_to_cpu(s->bmap[block_index]);
636 if (!VDI_IS_ALLOCATED(bmap_entry)) {
637
638 uint64_t data_offset;
639 qemu_co_rwlock_upgrade(&s->bmap_lock);
640 bmap_entry = le32_to_cpu(s->bmap[block_index]);
641 if (VDI_IS_ALLOCATED(bmap_entry)) {
642
643 qemu_co_rwlock_downgrade(&s->bmap_lock);
644 goto nonallocating_write;
645 }
646
647 bmap_entry = s->header.blocks_allocated;
648 s->bmap[block_index] = cpu_to_le32(bmap_entry);
649 s->header.blocks_allocated++;
650 data_offset = s->header.offset_data +
651 (uint64_t)bmap_entry * s->block_size;
652 if (block == NULL) {
653 block = g_malloc(s->block_size);
654 bmap_first = block_index;
655 }
656 bmap_last = block_index;
657
658 memset(block, 0, offset_in_block);
659 qemu_iovec_to_buf(qiov, bytes_done, block + offset_in_block,
660 n_bytes);
661 memset(block + offset_in_block + n_bytes, 0,
662 s->block_size - n_bytes - offset_in_block);
663
664
665
666
667
668 ret = bdrv_pwrite(bs->file, data_offset, block, s->block_size);
669 qemu_co_rwlock_unlock(&s->bmap_lock);
670 } else {
671nonallocating_write:
672 data_offset = s->header.offset_data +
673 (uint64_t)bmap_entry * s->block_size +
674 offset_in_block;
675 qemu_co_rwlock_unlock(&s->bmap_lock);
676
677 qemu_iovec_reset(&local_qiov);
678 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
679
680 ret = bdrv_co_pwritev(bs->file, data_offset, n_bytes,
681 &local_qiov, 0);
682 }
683
684 bytes -= n_bytes;
685 offset += n_bytes;
686 bytes_done += n_bytes;
687
688 logout("%u bytes written\n", n_bytes);
689 }
690
691 qemu_iovec_destroy(&local_qiov);
692
693 logout("finished data write\n");
694 if (ret < 0) {
695 return ret;
696 }
697
698 if (block) {
699
700 VdiHeader *header = (VdiHeader *) block;
701 uint8_t *base;
702 uint64_t offset;
703 uint32_t n_sectors;
704
705 logout("now writing modified header\n");
706 assert(VDI_IS_ALLOCATED(bmap_first));
707 *header = s->header;
708 vdi_header_to_le(header);
709 ret = bdrv_pwrite(bs->file, 0, block, sizeof(VdiHeader));
710 g_free(block);
711 block = NULL;
712
713 if (ret < 0) {
714 return ret;
715 }
716
717 logout("now writing modified block map entry %u...%u\n",
718 bmap_first, bmap_last);
719
720 bmap_first /= (SECTOR_SIZE / sizeof(uint32_t));
721 bmap_last /= (SECTOR_SIZE / sizeof(uint32_t));
722 n_sectors = bmap_last - bmap_first + 1;
723 offset = s->bmap_sector + bmap_first;
724 base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE;
725 logout("will write %u block map sectors starting from entry %u\n",
726 n_sectors, bmap_first);
727 ret = bdrv_pwrite(bs->file, offset * SECTOR_SIZE, base,
728 n_sectors * SECTOR_SIZE);
729 }
730
731 return ret < 0 ? ret : 0;
732}
733
734static int coroutine_fn vdi_co_do_create(BlockdevCreateOptions *create_options,
735 size_t block_size, Error **errp)
736{
737 BlockdevCreateOptionsVdi *vdi_opts;
738 int ret = 0;
739 uint64_t bytes = 0;
740 uint32_t blocks;
741 uint32_t image_type;
742 VdiHeader header;
743 size_t i;
744 size_t bmap_size;
745 int64_t offset = 0;
746 BlockDriverState *bs_file = NULL;
747 BlockBackend *blk = NULL;
748 uint32_t *bmap = NULL;
749 QemuUUID uuid;
750
751 assert(create_options->driver == BLOCKDEV_DRIVER_VDI);
752 vdi_opts = &create_options->u.vdi;
753
754 logout("\n");
755
756
757 bytes = vdi_opts->size;
758
759 if (!vdi_opts->has_preallocation) {
760 vdi_opts->preallocation = PREALLOC_MODE_OFF;
761 }
762 switch (vdi_opts->preallocation) {
763 case PREALLOC_MODE_OFF:
764 image_type = VDI_TYPE_DYNAMIC;
765 break;
766 case PREALLOC_MODE_METADATA:
767 image_type = VDI_TYPE_STATIC;
768 break;
769 default:
770 error_setg(errp, "Preallocation mode not supported for vdi");
771 return -EINVAL;
772 }
773
774#ifndef CONFIG_VDI_STATIC_IMAGE
775 if (image_type == VDI_TYPE_STATIC) {
776 ret = -ENOTSUP;
777 error_setg(errp, "Statically allocated images cannot be created in "
778 "this build");
779 goto exit;
780 }
781#endif
782#ifndef CONFIG_VDI_BLOCK_SIZE
783 if (block_size != DEFAULT_CLUSTER_SIZE) {
784 ret = -ENOTSUP;
785 error_setg(errp,
786 "A non-default cluster size is not supported in this build");
787 goto exit;
788 }
789#endif
790
791 if (bytes > VDI_DISK_SIZE_MAX) {
792 ret = -ENOTSUP;
793 error_setg(errp, "Unsupported VDI image size (size is 0x%" PRIx64
794 ", max supported is 0x%" PRIx64 ")",
795 bytes, VDI_DISK_SIZE_MAX);
796 goto exit;
797 }
798
799
800 bs_file = bdrv_open_blockdev_ref(vdi_opts->file, errp);
801 if (!bs_file) {
802 ret = -EIO;
803 goto exit;
804 }
805
806 blk = blk_new(bdrv_get_aio_context(bs_file),
807 BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL);
808 ret = blk_insert_bs(blk, bs_file, errp);
809 if (ret < 0) {
810 goto exit;
811 }
812
813 blk_set_allow_write_beyond_eof(blk, true);
814
815
816
817 blocks = DIV_ROUND_UP(bytes, block_size);
818
819 bmap_size = blocks * sizeof(uint32_t);
820 bmap_size = ROUND_UP(bmap_size, SECTOR_SIZE);
821
822 memset(&header, 0, sizeof(header));
823 pstrcpy(header.text, sizeof(header.text), VDI_TEXT);
824 header.signature = VDI_SIGNATURE;
825 header.version = VDI_VERSION_1_1;
826 header.header_size = 0x180;
827 header.image_type = image_type;
828 header.offset_bmap = 0x200;
829 header.offset_data = 0x200 + bmap_size;
830 header.sector_size = SECTOR_SIZE;
831 header.disk_size = bytes;
832 header.block_size = block_size;
833 header.blocks_in_image = blocks;
834 if (image_type == VDI_TYPE_STATIC) {
835 header.blocks_allocated = blocks;
836 }
837 qemu_uuid_generate(&uuid);
838 header.uuid_image = uuid;
839 qemu_uuid_generate(&uuid);
840 header.uuid_last_snap = uuid;
841
842 if (VDI_DEBUG) {
843 vdi_header_print(&header);
844 }
845 vdi_header_to_le(&header);
846 ret = blk_pwrite(blk, offset, &header, sizeof(header), 0);
847 if (ret < 0) {
848 error_setg(errp, "Error writing header");
849 goto exit;
850 }
851 offset += sizeof(header);
852
853 if (bmap_size > 0) {
854 bmap = g_try_malloc0(bmap_size);
855 if (bmap == NULL) {
856 ret = -ENOMEM;
857 error_setg(errp, "Could not allocate bmap");
858 goto exit;
859 }
860 for (i = 0; i < blocks; i++) {
861 if (image_type == VDI_TYPE_STATIC) {
862 bmap[i] = i;
863 } else {
864 bmap[i] = VDI_UNALLOCATED;
865 }
866 }
867 ret = blk_pwrite(blk, offset, bmap, bmap_size, 0);
868 if (ret < 0) {
869 error_setg(errp, "Error writing bmap");
870 goto exit;
871 }
872 offset += bmap_size;
873 }
874
875 if (image_type == VDI_TYPE_STATIC) {
876 ret = blk_truncate(blk, offset + blocks * block_size,
877 PREALLOC_MODE_OFF, errp);
878 if (ret < 0) {
879 error_prepend(errp, "Failed to statically allocate file");
880 goto exit;
881 }
882 }
883
884 ret = 0;
885exit:
886 blk_unref(blk);
887 bdrv_unref(bs_file);
888 g_free(bmap);
889 return ret;
890}
891
892static int coroutine_fn vdi_co_create(BlockdevCreateOptions *create_options,
893 Error **errp)
894{
895 return vdi_co_do_create(create_options, DEFAULT_CLUSTER_SIZE, errp);
896}
897
898static int coroutine_fn vdi_co_create_opts(const char *filename, QemuOpts *opts,
899 Error **errp)
900{
901 QDict *qdict = NULL;
902 BlockdevCreateOptions *create_options = NULL;
903 BlockDriverState *bs_file = NULL;
904 uint64_t block_size = DEFAULT_CLUSTER_SIZE;
905 bool is_static = false;
906 Visitor *v;
907 Error *local_err = NULL;
908 int ret;
909
910
911
912
913
914
915#if defined(CONFIG_VDI_BLOCK_SIZE)
916 block_size = qemu_opt_get_size_del(opts,
917 BLOCK_OPT_CLUSTER_SIZE,
918 DEFAULT_CLUSTER_SIZE);
919 if (block_size < BDRV_SECTOR_SIZE || block_size > UINT32_MAX ||
920 !is_power_of_2(block_size))
921 {
922 error_setg(errp, "Invalid cluster size");
923 ret = -EINVAL;
924 goto done;
925 }
926#endif
927 if (qemu_opt_get_bool_del(opts, BLOCK_OPT_STATIC, false)) {
928 is_static = true;
929 }
930
931 qdict = qemu_opts_to_qdict_filtered(opts, NULL, &vdi_create_opts, true);
932
933
934 ret = bdrv_create_file(filename, opts, errp);
935 if (ret < 0) {
936 goto done;
937 }
938
939 bs_file = bdrv_open(filename, NULL, NULL,
940 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
941 if (!bs_file) {
942 ret = -EIO;
943 goto done;
944 }
945
946 qdict_put_str(qdict, "driver", "vdi");
947 qdict_put_str(qdict, "file", bs_file->node_name);
948 if (is_static) {
949 qdict_put_str(qdict, "preallocation", "metadata");
950 }
951
952
953 v = qobject_input_visitor_new_flat_confused(qdict, errp);
954 if (!v) {
955 ret = -EINVAL;
956 goto done;
957 }
958 visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err);
959 visit_free(v);
960
961 if (local_err) {
962 error_propagate(errp, local_err);
963 ret = -EINVAL;
964 goto done;
965 }
966
967
968 assert(create_options->driver == BLOCKDEV_DRIVER_VDI);
969 create_options->u.vdi.size = ROUND_UP(create_options->u.vdi.size,
970 BDRV_SECTOR_SIZE);
971
972
973 ret = vdi_co_do_create(create_options, block_size, errp);
974done:
975 qobject_unref(qdict);
976 qapi_free_BlockdevCreateOptions(create_options);
977 bdrv_unref(bs_file);
978 return ret;
979}
980
981static void vdi_close(BlockDriverState *bs)
982{
983 BDRVVdiState *s = bs->opaque;
984
985 qemu_vfree(s->bmap);
986
987 migrate_del_blocker(s->migration_blocker);
988 error_free(s->migration_blocker);
989}
990
991static QemuOptsList vdi_create_opts = {
992 .name = "vdi-create-opts",
993 .head = QTAILQ_HEAD_INITIALIZER(vdi_create_opts.head),
994 .desc = {
995 {
996 .name = BLOCK_OPT_SIZE,
997 .type = QEMU_OPT_SIZE,
998 .help = "Virtual disk size"
999 },
1000#if defined(CONFIG_VDI_BLOCK_SIZE)
1001 {
1002 .name = BLOCK_OPT_CLUSTER_SIZE,
1003 .type = QEMU_OPT_SIZE,
1004 .help = "VDI cluster (block) size",
1005 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE)
1006 },
1007#endif
1008#if defined(CONFIG_VDI_STATIC_IMAGE)
1009 {
1010 .name = BLOCK_OPT_STATIC,
1011 .type = QEMU_OPT_BOOL,
1012 .help = "VDI static (pre-allocated) image",
1013 .def_value_str = "off"
1014 },
1015#endif
1016
1017 { }
1018 }
1019};
1020
1021static BlockDriver bdrv_vdi = {
1022 .format_name = "vdi",
1023 .instance_size = sizeof(BDRVVdiState),
1024 .bdrv_probe = vdi_probe,
1025 .bdrv_open = vdi_open,
1026 .bdrv_close = vdi_close,
1027 .bdrv_reopen_prepare = vdi_reopen_prepare,
1028 .bdrv_child_perm = bdrv_format_default_perms,
1029 .bdrv_co_create = vdi_co_create,
1030 .bdrv_co_create_opts = vdi_co_create_opts,
1031 .bdrv_has_zero_init = bdrv_has_zero_init_1,
1032 .bdrv_co_block_status = vdi_co_block_status,
1033 .bdrv_make_empty = vdi_make_empty,
1034
1035 .bdrv_co_preadv = vdi_co_preadv,
1036#if defined(CONFIG_VDI_WRITE)
1037 .bdrv_co_pwritev = vdi_co_pwritev,
1038#endif
1039
1040 .bdrv_get_info = vdi_get_info,
1041
1042 .create_opts = &vdi_create_opts,
1043 .bdrv_co_check = vdi_co_check,
1044};
1045
1046static void bdrv_vdi_init(void)
1047{
1048 logout("\n");
1049 bdrv_register(&bdrv_vdi);
1050}
1051
1052block_init(bdrv_vdi_init);
1053