2 * Block driver for Parallels disk image format
4 * Copyright (c) 2007 Alex Beregszaszi
5 * Copyright (c) 2015 Denis V. Lunev <den@openvz.org>
7 * This code was originally based on comparing different disk images created
8 * by Parallels. Currently it is based on opened OpenVZ sources
10 * http://git.openvz.org/?p=ploop;a=summary
12 * Permission is hereby granted, free of charge, to any person obtaining a copy
13 * of this software and associated documentation files (the "Software"), to deal
14 * in the Software without restriction, including without limitation the rights
15 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
16 * copies of the Software, and to permit persons to whom the Software is
17 * furnished to do so, subject to the following conditions:
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
27 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
31 #include "qemu/osdep.h"
32 #include "qapi/error.h"
33 #include "block/block_int.h"
34 #include "sysemu/block-backend.h"
35 #include "qemu/module.h"
36 #include "qemu/option.h"
37 #include "qemu/bswap.h"
38 #include "qemu/bitmap.h"
39 #include "migration/blocker.h"
40 #include "parallels.h"
42 /**************************************************************/
44 #define HEADER_MAGIC "WithoutFreeSpace"
45 #define HEADER_MAGIC2 "WithouFreSpacExt"
46 #define HEADER_VERSION 2
47 #define HEADER_INUSE_MAGIC (0x746F6E59)
48 #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32)
50 static QEnumLookup prealloc_mode_lookup
= {
51 .array
= (const char *const[]) {
55 .size
= PRL_PREALLOC_MODE__MAX
58 #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode"
59 #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size"
61 static QemuOptsList parallels_runtime_opts
= {
63 .head
= QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts
.head
),
66 .name
= PARALLELS_OPT_PREALLOC_SIZE
,
67 .type
= QEMU_OPT_SIZE
,
68 .help
= "Preallocation size on image expansion",
69 .def_value_str
= "128M",
72 .name
= PARALLELS_OPT_PREALLOC_MODE
,
73 .type
= QEMU_OPT_STRING
,
74 .help
= "Preallocation mode on image expansion "
75 "(allowed values: falloc, truncate)",
76 .def_value_str
= "falloc",
78 { /* end of list */ },
83 static int64_t bat2sect(BDRVParallelsState
*s
, uint32_t idx
)
85 return (uint64_t)le32_to_cpu(s
->bat_bitmap
[idx
]) * s
->off_multiplier
;
88 static uint32_t bat_entry_off(uint32_t idx
)
90 return sizeof(ParallelsHeader
) + sizeof(uint32_t) * idx
;
93 static int64_t seek_to_sector(BDRVParallelsState
*s
, int64_t sector_num
)
95 uint32_t index
, offset
;
97 index
= sector_num
/ s
->tracks
;
98 offset
= sector_num
% s
->tracks
;
101 if ((index
>= s
->bat_size
) || (s
->bat_bitmap
[index
] == 0)) {
104 return bat2sect(s
, index
) + offset
;
107 static int cluster_remainder(BDRVParallelsState
*s
, int64_t sector_num
,
110 int ret
= s
->tracks
- sector_num
% s
->tracks
;
111 return MIN(nb_sectors
, ret
);
114 static int64_t block_status(BDRVParallelsState
*s
, int64_t sector_num
,
115 int nb_sectors
, int *pnum
)
117 int64_t start_off
= -2, prev_end_off
= -2;
120 while (nb_sectors
> 0 || start_off
== -2) {
121 int64_t offset
= seek_to_sector(s
, sector_num
);
124 if (start_off
== -2) {
126 prev_end_off
= offset
;
127 } else if (offset
!= prev_end_off
) {
131 to_end
= cluster_remainder(s
, sector_num
, nb_sectors
);
132 nb_sectors
-= to_end
;
133 sector_num
+= to_end
;
137 prev_end_off
+= to_end
;
143 static int64_t allocate_clusters(BlockDriverState
*bs
, int64_t sector_num
,
144 int nb_sectors
, int *pnum
)
147 BDRVParallelsState
*s
= bs
->opaque
;
148 int64_t pos
, space
, idx
, to_allocate
, i
, len
;
150 pos
= block_status(s
, sector_num
, nb_sectors
, pnum
);
155 idx
= sector_num
/ s
->tracks
;
156 to_allocate
= DIV_ROUND_UP(sector_num
+ *pnum
, s
->tracks
) - idx
;
158 /* This function is called only by parallels_co_writev(), which will never
159 * pass a sector_num at or beyond the end of the image (because the block
160 * layer never passes such a sector_num to that function). Therefore, idx
161 * is always below s->bat_size.
162 * block_status() will limit *pnum so that sector_num + *pnum will not
163 * exceed the image end. Therefore, idx + to_allocate cannot exceed
165 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate
166 * will always fit into a uint32_t. */
167 assert(idx
< s
->bat_size
&& idx
+ to_allocate
<= s
->bat_size
);
169 space
= to_allocate
* s
->tracks
;
170 len
= bdrv_getlength(bs
->file
->bs
);
174 if (s
->data_end
+ space
> (len
>> BDRV_SECTOR_BITS
)) {
175 space
+= s
->prealloc_size
;
176 if (s
->prealloc_mode
== PRL_PREALLOC_MODE_FALLOCATE
) {
177 ret
= bdrv_pwrite_zeroes(bs
->file
,
178 s
->data_end
<< BDRV_SECTOR_BITS
,
179 space
<< BDRV_SECTOR_BITS
, 0);
181 ret
= bdrv_truncate(bs
->file
,
182 (s
->data_end
+ space
) << BDRV_SECTOR_BITS
,
183 PREALLOC_MODE_OFF
, NULL
);
190 /* Try to read from backing to fill empty clusters
191 * FIXME: 1. previous write_zeroes may be redundant
192 * 2. most of data we read from backing will be rewritten by
193 * parallels_co_writev. On aligned-to-cluster write we do not need
195 * 3. it would be good to combine write of data from backing and new
196 * data into one write call */
198 int64_t nb_cow_sectors
= to_allocate
* s
->tracks
;
199 int64_t nb_cow_bytes
= nb_cow_sectors
<< BDRV_SECTOR_BITS
;
202 .iov_len
= nb_cow_bytes
,
203 .iov_base
= qemu_blockalign(bs
, nb_cow_bytes
)
205 qemu_iovec_init_external(&qiov
, &iov
, 1);
207 ret
= bdrv_co_readv(bs
->backing
, idx
* s
->tracks
, nb_cow_sectors
,
210 qemu_vfree(iov
.iov_base
);
214 ret
= bdrv_co_writev(bs
->file
, s
->data_end
, nb_cow_sectors
, &qiov
);
215 qemu_vfree(iov
.iov_base
);
221 for (i
= 0; i
< to_allocate
; i
++) {
222 s
->bat_bitmap
[idx
+ i
] = cpu_to_le32(s
->data_end
/ s
->off_multiplier
);
223 s
->data_end
+= s
->tracks
;
224 bitmap_set(s
->bat_dirty_bmap
,
225 bat_entry_off(idx
+ i
) / s
->bat_dirty_block
, 1);
228 return bat2sect(s
, idx
) + sector_num
% s
->tracks
;
232 static coroutine_fn
int parallels_co_flush_to_os(BlockDriverState
*bs
)
234 BDRVParallelsState
*s
= bs
->opaque
;
235 unsigned long size
= DIV_ROUND_UP(s
->header_size
, s
->bat_dirty_block
);
238 qemu_co_mutex_lock(&s
->lock
);
240 bit
= find_first_bit(s
->bat_dirty_bmap
, size
);
242 uint32_t off
= bit
* s
->bat_dirty_block
;
243 uint32_t to_write
= s
->bat_dirty_block
;
246 if (off
+ to_write
> s
->header_size
) {
247 to_write
= s
->header_size
- off
;
249 ret
= bdrv_pwrite(bs
->file
, off
, (uint8_t *)s
->header
+ off
,
252 qemu_co_mutex_unlock(&s
->lock
);
255 bit
= find_next_bit(s
->bat_dirty_bmap
, size
, bit
+ 1);
257 bitmap_zero(s
->bat_dirty_bmap
, size
);
259 qemu_co_mutex_unlock(&s
->lock
);
264 static int coroutine_fn
parallels_co_block_status(BlockDriverState
*bs
,
270 BlockDriverState
**file
)
272 BDRVParallelsState
*s
= bs
->opaque
;
275 assert(QEMU_IS_ALIGNED(offset
| bytes
, BDRV_SECTOR_SIZE
));
276 qemu_co_mutex_lock(&s
->lock
);
277 offset
= block_status(s
, offset
>> BDRV_SECTOR_BITS
,
278 bytes
>> BDRV_SECTOR_BITS
, &count
);
279 qemu_co_mutex_unlock(&s
->lock
);
281 *pnum
= count
* BDRV_SECTOR_SIZE
;
286 *map
= offset
* BDRV_SECTOR_SIZE
;
287 *file
= bs
->file
->bs
;
288 return BDRV_BLOCK_DATA
| BDRV_BLOCK_OFFSET_VALID
;
291 static coroutine_fn
int parallels_co_writev(BlockDriverState
*bs
,
292 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
)
294 BDRVParallelsState
*s
= bs
->opaque
;
295 uint64_t bytes_done
= 0;
296 QEMUIOVector hd_qiov
;
299 qemu_iovec_init(&hd_qiov
, qiov
->niov
);
301 while (nb_sectors
> 0) {
305 qemu_co_mutex_lock(&s
->lock
);
306 position
= allocate_clusters(bs
, sector_num
, nb_sectors
, &n
);
307 qemu_co_mutex_unlock(&s
->lock
);
313 nbytes
= n
<< BDRV_SECTOR_BITS
;
315 qemu_iovec_reset(&hd_qiov
);
316 qemu_iovec_concat(&hd_qiov
, qiov
, bytes_done
, nbytes
);
318 ret
= bdrv_co_writev(bs
->file
, position
, n
, &hd_qiov
);
325 bytes_done
+= nbytes
;
328 qemu_iovec_destroy(&hd_qiov
);
332 static coroutine_fn
int parallels_co_readv(BlockDriverState
*bs
,
333 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
)
335 BDRVParallelsState
*s
= bs
->opaque
;
336 uint64_t bytes_done
= 0;
337 QEMUIOVector hd_qiov
;
340 qemu_iovec_init(&hd_qiov
, qiov
->niov
);
342 while (nb_sectors
> 0) {
346 qemu_co_mutex_lock(&s
->lock
);
347 position
= block_status(s
, sector_num
, nb_sectors
, &n
);
348 qemu_co_mutex_unlock(&s
->lock
);
350 nbytes
= n
<< BDRV_SECTOR_BITS
;
352 qemu_iovec_reset(&hd_qiov
);
353 qemu_iovec_concat(&hd_qiov
, qiov
, bytes_done
, nbytes
);
357 ret
= bdrv_co_readv(bs
->backing
, sector_num
, n
, &hd_qiov
);
362 qemu_iovec_memset(&hd_qiov
, 0, 0, nbytes
);
365 ret
= bdrv_co_readv(bs
->file
, position
, n
, &hd_qiov
);
373 bytes_done
+= nbytes
;
376 qemu_iovec_destroy(&hd_qiov
);
381 static int parallels_check(BlockDriverState
*bs
, BdrvCheckResult
*res
,
384 BDRVParallelsState
*s
= bs
->opaque
;
385 int64_t size
, prev_off
, high_off
;
388 bool flush_bat
= false;
389 int cluster_size
= s
->tracks
<< BDRV_SECTOR_BITS
;
391 size
= bdrv_getlength(bs
->file
->bs
);
397 if (s
->header_unclean
) {
398 fprintf(stderr
, "%s image was not closed correctly\n",
399 fix
& BDRV_FIX_ERRORS
? "Repairing" : "ERROR");
401 if (fix
& BDRV_FIX_ERRORS
) {
402 /* parallels_close will do the job right */
403 res
->corruptions_fixed
++;
404 s
->header_unclean
= false;
408 res
->bfi
.total_clusters
= s
->bat_size
;
409 res
->bfi
.compressed_clusters
= 0; /* compression is not supported */
413 for (i
= 0; i
< s
->bat_size
; i
++) {
414 int64_t off
= bat2sect(s
, i
) << BDRV_SECTOR_BITS
;
420 /* cluster outside the image */
422 fprintf(stderr
, "%s cluster %u is outside image\n",
423 fix
& BDRV_FIX_ERRORS
? "Repairing" : "ERROR", i
);
425 if (fix
& BDRV_FIX_ERRORS
) {
427 s
->bat_bitmap
[i
] = 0;
428 res
->corruptions_fixed
++;
434 res
->bfi
.allocated_clusters
++;
435 if (off
> high_off
) {
439 if (prev_off
!= 0 && (prev_off
+ cluster_size
) != off
) {
440 res
->bfi
.fragmented_clusters
++;
446 ret
= bdrv_pwrite_sync(bs
->file
, 0, s
->header
, s
->header_size
);
453 res
->image_end_offset
= high_off
+ cluster_size
;
454 if (size
> res
->image_end_offset
) {
456 count
= DIV_ROUND_UP(size
- res
->image_end_offset
, cluster_size
);
457 fprintf(stderr
, "%s space leaked at the end of the image %" PRId64
"\n",
458 fix
& BDRV_FIX_LEAKS
? "Repairing" : "ERROR",
459 size
- res
->image_end_offset
);
461 if (fix
& BDRV_FIX_LEAKS
) {
462 Error
*local_err
= NULL
;
463 ret
= bdrv_truncate(bs
->file
, res
->image_end_offset
,
464 PREALLOC_MODE_OFF
, &local_err
);
466 error_report_err(local_err
);
470 res
->leaks_fixed
+= count
;
478 static int coroutine_fn
parallels_co_create_opts(const char *filename
,
482 int64_t total_size
, cl_size
;
483 uint8_t tmp
[BDRV_SECTOR_SIZE
];
484 Error
*local_err
= NULL
;
486 uint32_t bat_entries
, bat_sectors
;
487 ParallelsHeader header
;
490 total_size
= ROUND_UP(qemu_opt_get_size_del(opts
, BLOCK_OPT_SIZE
, 0),
492 cl_size
= ROUND_UP(qemu_opt_get_size_del(opts
, BLOCK_OPT_CLUSTER_SIZE
,
493 DEFAULT_CLUSTER_SIZE
), BDRV_SECTOR_SIZE
);
494 if (total_size
>= MAX_PARALLELS_IMAGE_FACTOR
* cl_size
) {
495 error_propagate(errp
, local_err
);
499 ret
= bdrv_create_file(filename
, opts
, &local_err
);
501 error_propagate(errp
, local_err
);
505 file
= blk_new_open(filename
, NULL
, NULL
,
506 BDRV_O_RDWR
| BDRV_O_RESIZE
| BDRV_O_PROTOCOL
,
509 error_propagate(errp
, local_err
);
513 blk_set_allow_write_beyond_eof(file
, true);
515 ret
= blk_truncate(file
, 0, PREALLOC_MODE_OFF
, errp
);
520 bat_entries
= DIV_ROUND_UP(total_size
, cl_size
);
521 bat_sectors
= DIV_ROUND_UP(bat_entry_off(bat_entries
), cl_size
);
522 bat_sectors
= (bat_sectors
* cl_size
) >> BDRV_SECTOR_BITS
;
524 memset(&header
, 0, sizeof(header
));
525 memcpy(header
.magic
, HEADER_MAGIC2
, sizeof(header
.magic
));
526 header
.version
= cpu_to_le32(HEADER_VERSION
);
527 /* don't care much about geometry, it is not used on image level */
528 header
.heads
= cpu_to_le32(HEADS_NUMBER
);
529 header
.cylinders
= cpu_to_le32(total_size
/ BDRV_SECTOR_SIZE
530 / HEADS_NUMBER
/ SEC_IN_CYL
);
531 header
.tracks
= cpu_to_le32(cl_size
>> BDRV_SECTOR_BITS
);
532 header
.bat_entries
= cpu_to_le32(bat_entries
);
533 header
.nb_sectors
= cpu_to_le64(DIV_ROUND_UP(total_size
, BDRV_SECTOR_SIZE
));
534 header
.data_off
= cpu_to_le32(bat_sectors
);
536 /* write all the data */
537 memset(tmp
, 0, sizeof(tmp
));
538 memcpy(tmp
, &header
, sizeof(header
));
540 ret
= blk_pwrite(file
, 0, tmp
, BDRV_SECTOR_SIZE
, 0);
544 ret
= blk_pwrite_zeroes(file
, BDRV_SECTOR_SIZE
,
545 (bat_sectors
- 1) << BDRV_SECTOR_BITS
, 0);
556 error_setg_errno(errp
, -ret
, "Failed to create Parallels image");
561 static int parallels_probe(const uint8_t *buf
, int buf_size
,
562 const char *filename
)
564 const ParallelsHeader
*ph
= (const void *)buf
;
566 if (buf_size
< sizeof(ParallelsHeader
)) {
570 if ((!memcmp(ph
->magic
, HEADER_MAGIC
, 16) ||
571 !memcmp(ph
->magic
, HEADER_MAGIC2
, 16)) &&
572 (le32_to_cpu(ph
->version
) == HEADER_VERSION
)) {
579 static int parallels_update_header(BlockDriverState
*bs
)
581 BDRVParallelsState
*s
= bs
->opaque
;
582 unsigned size
= MAX(bdrv_opt_mem_align(bs
->file
->bs
),
583 sizeof(ParallelsHeader
));
585 if (size
> s
->header_size
) {
586 size
= s
->header_size
;
588 return bdrv_pwrite_sync(bs
->file
, 0, s
->header
, size
);
591 static int parallels_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
594 BDRVParallelsState
*s
= bs
->opaque
;
597 QemuOpts
*opts
= NULL
;
598 Error
*local_err
= NULL
;
601 bs
->file
= bdrv_open_child(NULL
, options
, "file", bs
, &child_file
,
607 ret
= bdrv_pread(bs
->file
, 0, &ph
, sizeof(ph
));
612 bs
->total_sectors
= le64_to_cpu(ph
.nb_sectors
);
614 if (le32_to_cpu(ph
.version
) != HEADER_VERSION
) {
617 if (!memcmp(ph
.magic
, HEADER_MAGIC
, 16)) {
618 s
->off_multiplier
= 1;
619 bs
->total_sectors
= 0xffffffff & bs
->total_sectors
;
620 } else if (!memcmp(ph
.magic
, HEADER_MAGIC2
, 16)) {
621 s
->off_multiplier
= le32_to_cpu(ph
.tracks
);
626 s
->tracks
= le32_to_cpu(ph
.tracks
);
627 if (s
->tracks
== 0) {
628 error_setg(errp
, "Invalid image: Zero sectors per track");
632 if (s
->tracks
> INT32_MAX
/513) {
633 error_setg(errp
, "Invalid image: Too big cluster");
638 s
->bat_size
= le32_to_cpu(ph
.bat_entries
);
639 if (s
->bat_size
> INT_MAX
/ sizeof(uint32_t)) {
640 error_setg(errp
, "Catalog too large");
645 size
= bat_entry_off(s
->bat_size
);
646 s
->header_size
= ROUND_UP(size
, bdrv_opt_mem_align(bs
->file
->bs
));
647 s
->header
= qemu_try_blockalign(bs
->file
->bs
, s
->header_size
);
648 if (s
->header
== NULL
) {
652 s
->data_end
= le32_to_cpu(ph
.data_off
);
653 if (s
->data_end
== 0) {
654 s
->data_end
= ROUND_UP(bat_entry_off(s
->bat_size
), BDRV_SECTOR_SIZE
);
656 if (s
->data_end
< s
->header_size
) {
657 /* there is not enough unused space to fit to block align between BAT
658 and actual data. We can't avoid read-modify-write... */
659 s
->header_size
= size
;
662 ret
= bdrv_pread(bs
->file
, 0, s
->header
, s
->header_size
);
666 s
->bat_bitmap
= (uint32_t *)(s
->header
+ 1);
668 for (i
= 0; i
< s
->bat_size
; i
++) {
669 int64_t off
= bat2sect(s
, i
);
670 if (off
>= s
->data_end
) {
671 s
->data_end
= off
+ s
->tracks
;
675 if (le32_to_cpu(ph
.inuse
) == HEADER_INUSE_MAGIC
) {
676 /* Image was not closed correctly. The check is mandatory */
677 s
->header_unclean
= true;
678 if ((flags
& BDRV_O_RDWR
) && !(flags
& BDRV_O_CHECK
)) {
679 error_setg(errp
, "parallels: Image was not closed correctly; "
680 "cannot be opened read/write");
686 opts
= qemu_opts_create(¶llels_runtime_opts
, NULL
, 0, &local_err
);
687 if (local_err
!= NULL
) {
691 qemu_opts_absorb_qdict(opts
, options
, &local_err
);
692 if (local_err
!= NULL
) {
697 qemu_opt_get_size_del(opts
, PARALLELS_OPT_PREALLOC_SIZE
, 0);
698 s
->prealloc_size
= MAX(s
->tracks
, s
->prealloc_size
>> BDRV_SECTOR_BITS
);
699 buf
= qemu_opt_get_del(opts
, PARALLELS_OPT_PREALLOC_MODE
);
700 s
->prealloc_mode
= qapi_enum_parse(&prealloc_mode_lookup
, buf
,
701 PRL_PREALLOC_MODE_FALLOCATE
,
704 if (local_err
!= NULL
) {
708 if (!bdrv_has_zero_init(bs
->file
->bs
)) {
709 s
->prealloc_mode
= PRL_PREALLOC_MODE_FALLOCATE
;
712 if ((flags
& BDRV_O_RDWR
) && !(flags
& BDRV_O_INACTIVE
)) {
713 s
->header
->inuse
= cpu_to_le32(HEADER_INUSE_MAGIC
);
714 ret
= parallels_update_header(bs
);
720 s
->bat_dirty_block
= 4 * getpagesize();
722 bitmap_new(DIV_ROUND_UP(s
->header_size
, s
->bat_dirty_block
));
724 /* Disable migration until bdrv_invalidate_cache method is added */
725 error_setg(&s
->migration_blocker
, "The Parallels format used by node '%s' "
726 "does not support live migration",
727 bdrv_get_device_or_node_name(bs
));
728 ret
= migrate_add_blocker(s
->migration_blocker
, &local_err
);
730 error_propagate(errp
, local_err
);
731 error_free(s
->migration_blocker
);
734 qemu_co_mutex_init(&s
->lock
);
738 error_setg(errp
, "Image not in Parallels format");
741 qemu_vfree(s
->header
);
745 error_propagate(errp
, local_err
);
751 static void parallels_close(BlockDriverState
*bs
)
753 BDRVParallelsState
*s
= bs
->opaque
;
755 if ((bs
->open_flags
& BDRV_O_RDWR
) && !(bs
->open_flags
& BDRV_O_INACTIVE
)) {
756 s
->header
->inuse
= 0;
757 parallels_update_header(bs
);
758 bdrv_truncate(bs
->file
, s
->data_end
<< BDRV_SECTOR_BITS
,
759 PREALLOC_MODE_OFF
, NULL
);
762 g_free(s
->bat_dirty_bmap
);
763 qemu_vfree(s
->header
);
765 migrate_del_blocker(s
->migration_blocker
);
766 error_free(s
->migration_blocker
);
769 static QemuOptsList parallels_create_opts
= {
770 .name
= "parallels-create-opts",
771 .head
= QTAILQ_HEAD_INITIALIZER(parallels_create_opts
.head
),
774 .name
= BLOCK_OPT_SIZE
,
775 .type
= QEMU_OPT_SIZE
,
776 .help
= "Virtual disk size",
779 .name
= BLOCK_OPT_CLUSTER_SIZE
,
780 .type
= QEMU_OPT_SIZE
,
781 .help
= "Parallels image cluster size",
782 .def_value_str
= stringify(DEFAULT_CLUSTER_SIZE
),
784 { /* end of list */ }
788 static BlockDriver bdrv_parallels
= {
789 .format_name
= "parallels",
790 .instance_size
= sizeof(BDRVParallelsState
),
791 .bdrv_probe
= parallels_probe
,
792 .bdrv_open
= parallels_open
,
793 .bdrv_close
= parallels_close
,
794 .bdrv_child_perm
= bdrv_format_default_perms
,
795 .bdrv_co_block_status
= parallels_co_block_status
,
796 .bdrv_has_zero_init
= bdrv_has_zero_init_1
,
797 .bdrv_co_flush_to_os
= parallels_co_flush_to_os
,
798 .bdrv_co_readv
= parallels_co_readv
,
799 .bdrv_co_writev
= parallels_co_writev
,
800 .supports_backing
= true,
801 .bdrv_co_create_opts
= parallels_co_create_opts
,
802 .bdrv_check
= parallels_check
,
803 .create_opts
= ¶llels_create_opts
,
806 static void bdrv_parallels_init(void)
808 bdrv_register(&bdrv_parallels
);
811 block_init(bdrv_parallels_init
);