1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30#include "qemu/osdep.h"
31#include "qapi/error.h"
32#include "qemu-common.h"
33#include "block/block_int.h"
34#include "sysemu/block-backend.h"
35#include "qemu/module.h"
36#include "qemu/bitmap.h"
37#include "qapi/util.h"
38
39
40
41#define HEADER_MAGIC "WithoutFreeSpace"
42#define HEADER_MAGIC2 "WithouFreSpacExt"
43#define HEADER_VERSION 2
44#define HEADER_INUSE_MAGIC (0x746F6E59)
45
46#define DEFAULT_CLUSTER_SIZE 1048576
47
48
49
50typedef struct ParallelsHeader {
51 char magic[16];
52 uint32_t version;
53 uint32_t heads;
54 uint32_t cylinders;
55 uint32_t tracks;
56 uint32_t bat_entries;
57 uint64_t nb_sectors;
58 uint32_t inuse;
59 uint32_t data_off;
60 char padding[12];
61} QEMU_PACKED ParallelsHeader;
62
63
64typedef enum ParallelsPreallocMode {
65 PRL_PREALLOC_MODE_FALLOCATE = 0,
66 PRL_PREALLOC_MODE_TRUNCATE = 1,
67 PRL_PREALLOC_MODE__MAX = 2,
68} ParallelsPreallocMode;
69
70static const char *prealloc_mode_lookup[] = {
71 "falloc",
72 "truncate",
73 NULL,
74};
75
76
77typedef struct BDRVParallelsState {
78
79
80
81
82 CoMutex lock;
83
84 ParallelsHeader *header;
85 uint32_t header_size;
86 bool header_unclean;
87
88 unsigned long *bat_dirty_bmap;
89 unsigned int bat_dirty_block;
90
91 uint32_t *bat_bitmap;
92 unsigned int bat_size;
93
94 int64_t data_end;
95 uint64_t prealloc_size;
96 ParallelsPreallocMode prealloc_mode;
97
98 unsigned int tracks;
99
100 unsigned int off_multiplier;
101} BDRVParallelsState;
102
103
104#define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode"
105#define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size"
106
107static QemuOptsList parallels_runtime_opts = {
108 .name = "parallels",
109 .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head),
110 .desc = {
111 {
112 .name = PARALLELS_OPT_PREALLOC_SIZE,
113 .type = QEMU_OPT_SIZE,
114 .help = "Preallocation size on image expansion",
115 .def_value_str = "128MiB",
116 },
117 {
118 .name = PARALLELS_OPT_PREALLOC_MODE,
119 .type = QEMU_OPT_STRING,
120 .help = "Preallocation mode on image expansion "
121 "(allowed values: falloc, truncate)",
122 .def_value_str = "falloc",
123 },
124 { },
125 },
126};
127
128
129static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx)
130{
131 return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier;
132}
133
134static uint32_t bat_entry_off(uint32_t idx)
135{
136 return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx;
137}
138
139static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num)
140{
141 uint32_t index, offset;
142
143 index = sector_num / s->tracks;
144 offset = sector_num % s->tracks;
145
146
147 if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) {
148 return -1;
149 }
150 return bat2sect(s, index) + offset;
151}
152
153static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
154 int nb_sectors)
155{
156 int ret = s->tracks - sector_num % s->tracks;
157 return MIN(nb_sectors, ret);
158}
159
160static int64_t block_status(BDRVParallelsState *s, int64_t sector_num,
161 int nb_sectors, int *pnum)
162{
163 int64_t start_off = -2, prev_end_off = -2;
164
165 *pnum = 0;
166 while (nb_sectors > 0 || start_off == -2) {
167 int64_t offset = seek_to_sector(s, sector_num);
168 int to_end;
169
170 if (start_off == -2) {
171 start_off = offset;
172 prev_end_off = offset;
173 } else if (offset != prev_end_off) {
174 break;
175 }
176
177 to_end = cluster_remainder(s, sector_num, nb_sectors);
178 nb_sectors -= to_end;
179 sector_num += to_end;
180 *pnum += to_end;
181
182 if (offset > 0) {
183 prev_end_off += to_end;
184 }
185 }
186 return start_off;
187}
188
189static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num,
190 int nb_sectors, int *pnum)
191{
192 BDRVParallelsState *s = bs->opaque;
193 uint32_t idx, to_allocate, i;
194 int64_t pos, space;
195
196 pos = block_status(s, sector_num, nb_sectors, pnum);
197 if (pos > 0) {
198 return pos;
199 }
200
201 idx = sector_num / s->tracks;
202 if (idx >= s->bat_size) {
203 return -EINVAL;
204 }
205
206 to_allocate = (sector_num + *pnum + s->tracks - 1) / s->tracks - idx;
207 space = to_allocate * s->tracks;
208 if (s->data_end + space > bdrv_getlength(bs->file->bs) >> BDRV_SECTOR_BITS) {
209 int ret;
210 space += s->prealloc_size;
211 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
212 ret = bdrv_write_zeroes(bs->file->bs, s->data_end, space, 0);
213 } else {
214 ret = bdrv_truncate(bs->file->bs,
215 (s->data_end + space) << BDRV_SECTOR_BITS);
216 }
217 if (ret < 0) {
218 return ret;
219 }
220 }
221
222 for (i = 0; i < to_allocate; i++) {
223 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier);
224 s->data_end += s->tracks;
225 bitmap_set(s->bat_dirty_bmap,
226 bat_entry_off(idx + i) / s->bat_dirty_block, 1);
227 }
228
229 return bat2sect(s, idx) + sector_num % s->tracks;
230}
231
232
233static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs)
234{
235 BDRVParallelsState *s = bs->opaque;
236 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block);
237 unsigned long bit;
238
239 qemu_co_mutex_lock(&s->lock);
240
241 bit = find_first_bit(s->bat_dirty_bmap, size);
242 while (bit < size) {
243 uint32_t off = bit * s->bat_dirty_block;
244 uint32_t to_write = s->bat_dirty_block;
245 int ret;
246
247 if (off + to_write > s->header_size) {
248 to_write = s->header_size - off;
249 }
250 ret = bdrv_pwrite(bs->file->bs, off, (uint8_t *)s->header + off,
251 to_write);
252 if (ret < 0) {
253 qemu_co_mutex_unlock(&s->lock);
254 return ret;
255 }
256 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1);
257 }
258 bitmap_zero(s->bat_dirty_bmap, size);
259
260 qemu_co_mutex_unlock(&s->lock);
261 return 0;
262}
263
264
265static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs,
266 int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
267{
268 BDRVParallelsState *s = bs->opaque;
269 int64_t offset;
270
271 qemu_co_mutex_lock(&s->lock);
272 offset = block_status(s, sector_num, nb_sectors, pnum);
273 qemu_co_mutex_unlock(&s->lock);
274
275 if (offset < 0) {
276 return 0;
277 }
278
279 *file = bs->file->bs;
280 return (offset << BDRV_SECTOR_BITS) |
281 BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
282}
283
284static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
285 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
286{
287 BDRVParallelsState *s = bs->opaque;
288 uint64_t bytes_done = 0;
289 QEMUIOVector hd_qiov;
290 int ret = 0;
291
292 qemu_iovec_init(&hd_qiov, qiov->niov);
293
294 while (nb_sectors > 0) {
295 int64_t position;
296 int n, nbytes;
297
298 qemu_co_mutex_lock(&s->lock);
299 position = allocate_clusters(bs, sector_num, nb_sectors, &n);
300 qemu_co_mutex_unlock(&s->lock);
301 if (position < 0) {
302 ret = (int)position;
303 break;
304 }
305
306 nbytes = n << BDRV_SECTOR_BITS;
307
308 qemu_iovec_reset(&hd_qiov);
309 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
310
311 ret = bdrv_co_writev(bs->file->bs, position, n, &hd_qiov);
312 if (ret < 0) {
313 break;
314 }
315
316 nb_sectors -= n;
317 sector_num += n;
318 bytes_done += nbytes;
319 }
320
321 qemu_iovec_destroy(&hd_qiov);
322 return ret;
323}
324
325static coroutine_fn int parallels_co_readv(BlockDriverState *bs,
326 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
327{
328 BDRVParallelsState *s = bs->opaque;
329 uint64_t bytes_done = 0;
330 QEMUIOVector hd_qiov;
331 int ret = 0;
332
333 qemu_iovec_init(&hd_qiov, qiov->niov);
334
335 while (nb_sectors > 0) {
336 int64_t position;
337 int n, nbytes;
338
339 qemu_co_mutex_lock(&s->lock);
340 position = block_status(s, sector_num, nb_sectors, &n);
341 qemu_co_mutex_unlock(&s->lock);
342
343 nbytes = n << BDRV_SECTOR_BITS;
344
345 if (position < 0) {
346 qemu_iovec_memset(qiov, bytes_done, 0, nbytes);
347 } else {
348 qemu_iovec_reset(&hd_qiov);
349 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
350
351 ret = bdrv_co_readv(bs->file->bs, position, n, &hd_qiov);
352 if (ret < 0) {
353 break;
354 }
355 }
356
357 nb_sectors -= n;
358 sector_num += n;
359 bytes_done += nbytes;
360 }
361
362 qemu_iovec_destroy(&hd_qiov);
363 return ret;
364}
365
366
367static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res,
368 BdrvCheckMode fix)
369{
370 BDRVParallelsState *s = bs->opaque;
371 int64_t size, prev_off, high_off;
372 int ret;
373 uint32_t i;
374 bool flush_bat = false;
375 int cluster_size = s->tracks << BDRV_SECTOR_BITS;
376
377 size = bdrv_getlength(bs->file->bs);
378 if (size < 0) {
379 res->check_errors++;
380 return size;
381 }
382
383 if (s->header_unclean) {
384 fprintf(stderr, "%s image was not closed correctly\n",
385 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
386 res->corruptions++;
387 if (fix & BDRV_FIX_ERRORS) {
388
389 res->corruptions_fixed++;
390 s->header_unclean = false;
391 }
392 }
393
394 res->bfi.total_clusters = s->bat_size;
395 res->bfi.compressed_clusters = 0;
396
397 high_off = 0;
398 prev_off = 0;
399 for (i = 0; i < s->bat_size; i++) {
400 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS;
401 if (off == 0) {
402 prev_off = 0;
403 continue;
404 }
405
406
407 if (off > size) {
408 fprintf(stderr, "%s cluster %u is outside image\n",
409 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
410 res->corruptions++;
411 if (fix & BDRV_FIX_ERRORS) {
412 prev_off = 0;
413 s->bat_bitmap[i] = 0;
414 res->corruptions_fixed++;
415 flush_bat = true;
416 continue;
417 }
418 }
419
420 res->bfi.allocated_clusters++;
421 if (off > high_off) {
422 high_off = off;
423 }
424
425 if (prev_off != 0 && (prev_off + cluster_size) != off) {
426 res->bfi.fragmented_clusters++;
427 }
428 prev_off = off;
429 }
430
431 if (flush_bat) {
432 ret = bdrv_pwrite_sync(bs->file->bs, 0, s->header, s->header_size);
433 if (ret < 0) {
434 res->check_errors++;
435 return ret;
436 }
437 }
438
439 res->image_end_offset = high_off + cluster_size;
440 if (size > res->image_end_offset) {
441 int64_t count;
442 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size);
443 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
444 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
445 size - res->image_end_offset);
446 res->leaks += count;
447 if (fix & BDRV_FIX_LEAKS) {
448 ret = bdrv_truncate(bs->file->bs, res->image_end_offset);
449 if (ret < 0) {
450 res->check_errors++;
451 return ret;
452 }
453 res->leaks_fixed += count;
454 }
455 }
456
457 return 0;
458}
459
460
461static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
462{
463 int64_t total_size, cl_size;
464 uint8_t tmp[BDRV_SECTOR_SIZE];
465 Error *local_err = NULL;
466 BlockBackend *file;
467 uint32_t bat_entries, bat_sectors;
468 ParallelsHeader header;
469 int ret;
470
471 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
472 BDRV_SECTOR_SIZE);
473 cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
474 DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE);
475
476 ret = bdrv_create_file(filename, opts, &local_err);
477 if (ret < 0) {
478 error_propagate(errp, local_err);
479 return ret;
480 }
481
482 file = blk_new_open(filename, NULL, NULL,
483 BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err);
484 if (file == NULL) {
485 error_propagate(errp, local_err);
486 return -EIO;
487 }
488
489 blk_set_allow_write_beyond_eof(file, true);
490
491 ret = blk_truncate(file, 0);
492 if (ret < 0) {
493 goto exit;
494 }
495
496 bat_entries = DIV_ROUND_UP(total_size, cl_size);
497 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size);
498 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS;
499
500 memset(&header, 0, sizeof(header));
501 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
502 header.version = cpu_to_le32(HEADER_VERSION);
503
504 header.heads = cpu_to_le32(16);
505 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32);
506 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
507 header.bat_entries = cpu_to_le32(bat_entries);
508 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));
509 header.data_off = cpu_to_le32(bat_sectors);
510
511
512 memset(tmp, 0, sizeof(tmp));
513 memcpy(tmp, &header, sizeof(header));
514
515 ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE);
516 if (ret < 0) {
517 goto exit;
518 }
519 ret = blk_write_zeroes(file, 1, bat_sectors - 1, 0);
520 if (ret < 0) {
521 goto exit;
522 }
523 ret = 0;
524
525done:
526 blk_unref(file);
527 return ret;
528
529exit:
530 error_setg_errno(errp, -ret, "Failed to create Parallels image");
531 goto done;
532}
533
534
535static int parallels_probe(const uint8_t *buf, int buf_size,
536 const char *filename)
537{
538 const ParallelsHeader *ph = (const void *)buf;
539
540 if (buf_size < sizeof(ParallelsHeader)) {
541 return 0;
542 }
543
544 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) ||
545 !memcmp(ph->magic, HEADER_MAGIC2, 16)) &&
546 (le32_to_cpu(ph->version) == HEADER_VERSION)) {
547 return 100;
548 }
549
550 return 0;
551}
552
553static int parallels_update_header(BlockDriverState *bs)
554{
555 BDRVParallelsState *s = bs->opaque;
556 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs),
557 sizeof(ParallelsHeader));
558
559 if (size > s->header_size) {
560 size = s->header_size;
561 }
562 return bdrv_pwrite_sync(bs->file->bs, 0, s->header, size);
563}
564
565static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
566 Error **errp)
567{
568 BDRVParallelsState *s = bs->opaque;
569 ParallelsHeader ph;
570 int ret, size, i;
571 QemuOpts *opts = NULL;
572 Error *local_err = NULL;
573 char *buf;
574
575 ret = bdrv_pread(bs->file->bs, 0, &ph, sizeof(ph));
576 if (ret < 0) {
577 goto fail;
578 }
579
580 bs->total_sectors = le64_to_cpu(ph.nb_sectors);
581
582 if (le32_to_cpu(ph.version) != HEADER_VERSION) {
583 goto fail_format;
584 }
585 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) {
586 s->off_multiplier = 1;
587 bs->total_sectors = 0xffffffff & bs->total_sectors;
588 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) {
589 s->off_multiplier = le32_to_cpu(ph.tracks);
590 } else {
591 goto fail_format;
592 }
593
594 s->tracks = le32_to_cpu(ph.tracks);
595 if (s->tracks == 0) {
596 error_setg(errp, "Invalid image: Zero sectors per track");
597 ret = -EINVAL;
598 goto fail;
599 }
600 if (s->tracks > INT32_MAX/513) {
601 error_setg(errp, "Invalid image: Too big cluster");
602 ret = -EFBIG;
603 goto fail;
604 }
605
606 s->bat_size = le32_to_cpu(ph.bat_entries);
607 if (s->bat_size > INT_MAX / sizeof(uint32_t)) {
608 error_setg(errp, "Catalog too large");
609 ret = -EFBIG;
610 goto fail;
611 }
612
613 size = bat_entry_off(s->bat_size);
614 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs));
615 s->header = qemu_try_blockalign(bs->file->bs, s->header_size);
616 if (s->header == NULL) {
617 ret = -ENOMEM;
618 goto fail;
619 }
620 s->data_end = le32_to_cpu(ph.data_off);
621 if (s->data_end == 0) {
622 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE);
623 }
624 if (s->data_end < s->header_size) {
625
626
627 s->header_size = size;
628 }
629
630 ret = bdrv_pread(bs->file->bs, 0, s->header, s->header_size);
631 if (ret < 0) {
632 goto fail;
633 }
634 s->bat_bitmap = (uint32_t *)(s->header + 1);
635
636 for (i = 0; i < s->bat_size; i++) {
637 int64_t off = bat2sect(s, i);
638 if (off >= s->data_end) {
639 s->data_end = off + s->tracks;
640 }
641 }
642
643 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) {
644
645 s->header_unclean = true;
646 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) {
647 error_setg(errp, "parallels: Image was not closed correctly; "
648 "cannot be opened read/write");
649 ret = -EACCES;
650 goto fail;
651 }
652 }
653
654 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err);
655 if (local_err != NULL) {
656 goto fail_options;
657 }
658
659 qemu_opts_absorb_qdict(opts, options, &local_err);
660 if (local_err != NULL) {
661 goto fail_options;
662 }
663
664 s->prealloc_size =
665 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0);
666 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS);
667 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE);
668 s->prealloc_mode = qapi_enum_parse(prealloc_mode_lookup, buf,
669 PRL_PREALLOC_MODE__MAX, PRL_PREALLOC_MODE_FALLOCATE, &local_err);
670 g_free(buf);
671 if (local_err != NULL) {
672 goto fail_options;
673 }
674 if (!bdrv_has_zero_init(bs->file->bs) ||
675 bdrv_truncate(bs->file->bs, bdrv_getlength(bs->file->bs)) != 0) {
676 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
677 }
678
679 if (flags & BDRV_O_RDWR) {
680 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC);
681 ret = parallels_update_header(bs);
682 if (ret < 0) {
683 goto fail;
684 }
685 }
686
687 s->bat_dirty_block = 4 * getpagesize();
688 s->bat_dirty_bmap =
689 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block));
690
691 qemu_co_mutex_init(&s->lock);
692 return 0;
693
694fail_format:
695 error_setg(errp, "Image not in Parallels format");
696 ret = -EINVAL;
697fail:
698 qemu_vfree(s->header);
699 return ret;
700
701fail_options:
702 error_propagate(errp, local_err);
703 ret = -EINVAL;
704 goto fail;
705}
706
707
708static void parallels_close(BlockDriverState *bs)
709{
710 BDRVParallelsState *s = bs->opaque;
711
712 if (bs->open_flags & BDRV_O_RDWR) {
713 s->header->inuse = 0;
714 parallels_update_header(bs);
715 }
716
717 if (bs->open_flags & BDRV_O_RDWR) {
718 bdrv_truncate(bs->file->bs, s->data_end << BDRV_SECTOR_BITS);
719 }
720
721 g_free(s->bat_dirty_bmap);
722 qemu_vfree(s->header);
723}
724
725static QemuOptsList parallels_create_opts = {
726 .name = "parallels-create-opts",
727 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
728 .desc = {
729 {
730 .name = BLOCK_OPT_SIZE,
731 .type = QEMU_OPT_SIZE,
732 .help = "Virtual disk size",
733 },
734 {
735 .name = BLOCK_OPT_CLUSTER_SIZE,
736 .type = QEMU_OPT_SIZE,
737 .help = "Parallels image cluster size",
738 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
739 },
740 { }
741 }
742};
743
744static BlockDriver bdrv_parallels = {
745 .format_name = "parallels",
746 .instance_size = sizeof(BDRVParallelsState),
747 .bdrv_probe = parallels_probe,
748 .bdrv_open = parallels_open,
749 .bdrv_close = parallels_close,
750 .bdrv_co_get_block_status = parallels_co_get_block_status,
751 .bdrv_has_zero_init = bdrv_has_zero_init_1,
752 .bdrv_co_flush_to_os = parallels_co_flush_to_os,
753 .bdrv_co_readv = parallels_co_readv,
754 .bdrv_co_writev = parallels_co_writev,
755
756 .bdrv_create = parallels_create,
757 .bdrv_check = parallels_check,
758 .create_opts = ¶llels_create_opts,
759};
760
761static void bdrv_parallels_init(void)
762{
763 bdrv_register(&bdrv_parallels);
764}
765
766block_init(bdrv_parallels_init);
767