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 "qemu/error-report.h"
33 #include "qapi/error.h"
34 #include "block/block_int.h"
35 #include "block/qdict.h"
36 #include "sysemu/block-backend.h"
37 #include "qemu/module.h"
38 #include "qemu/option.h"
39 #include "qapi/qmp/qdict.h"
40 #include "qapi/qobject-input-visitor.h"
41 #include "qapi/qapi-visit-block-core.h"
42 #include "qemu/bswap.h"
43 #include "qemu/bitmap.h"
44 #include "qemu/memalign.h"
45 #include "migration/blocker.h"
46 #include "parallels.h"
48 /**************************************************************/
50 #define HEADER_MAGIC "WithoutFreeSpace"
51 #define HEADER_MAGIC2 "WithouFreSpacExt"
52 #define HEADER_VERSION 2
53 #define HEADER_INUSE_MAGIC (0x746F6E59)
54 #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32)
56 static QEnumLookup prealloc_mode_lookup
= {
57 .array
= (const char *const[]) {
61 .size
= PRL_PREALLOC_MODE__MAX
64 #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode"
65 #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size"
67 static QemuOptsList parallels_runtime_opts
= {
69 .head
= QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts
.head
),
72 .name
= PARALLELS_OPT_PREALLOC_SIZE
,
73 .type
= QEMU_OPT_SIZE
,
74 .help
= "Preallocation size on image expansion",
75 .def_value_str
= "128M",
78 .name
= PARALLELS_OPT_PREALLOC_MODE
,
79 .type
= QEMU_OPT_STRING
,
80 .help
= "Preallocation mode on image expansion "
81 "(allowed values: falloc, truncate)",
82 .def_value_str
= "falloc",
84 { /* end of list */ },
88 static QemuOptsList parallels_create_opts
= {
89 .name
= "parallels-create-opts",
90 .head
= QTAILQ_HEAD_INITIALIZER(parallels_create_opts
.head
),
93 .name
= BLOCK_OPT_SIZE
,
94 .type
= QEMU_OPT_SIZE
,
95 .help
= "Virtual disk size",
98 .name
= BLOCK_OPT_CLUSTER_SIZE
,
99 .type
= QEMU_OPT_SIZE
,
100 .help
= "Parallels image cluster size",
101 .def_value_str
= stringify(DEFAULT_CLUSTER_SIZE
),
103 { /* end of list */ }
108 static int64_t bat2sect(BDRVParallelsState
*s
, uint32_t idx
)
110 return (uint64_t)le32_to_cpu(s
->bat_bitmap
[idx
]) * s
->off_multiplier
;
113 static uint32_t bat_entry_off(uint32_t idx
)
115 return sizeof(ParallelsHeader
) + sizeof(uint32_t) * idx
;
118 static int64_t seek_to_sector(BDRVParallelsState
*s
, int64_t sector_num
)
120 uint32_t index
, offset
;
122 index
= sector_num
/ s
->tracks
;
123 offset
= sector_num
% s
->tracks
;
126 if ((index
>= s
->bat_size
) || (s
->bat_bitmap
[index
] == 0)) {
129 return bat2sect(s
, index
) + offset
;
132 static int cluster_remainder(BDRVParallelsState
*s
, int64_t sector_num
,
135 int ret
= s
->tracks
- sector_num
% s
->tracks
;
136 return MIN(nb_sectors
, ret
);
139 static int64_t block_status(BDRVParallelsState
*s
, int64_t sector_num
,
140 int nb_sectors
, int *pnum
)
142 int64_t start_off
= -2, prev_end_off
= -2;
145 while (nb_sectors
> 0 || start_off
== -2) {
146 int64_t offset
= seek_to_sector(s
, sector_num
);
149 if (start_off
== -2) {
151 prev_end_off
= offset
;
152 } else if (offset
!= prev_end_off
) {
156 to_end
= cluster_remainder(s
, sector_num
, nb_sectors
);
157 nb_sectors
-= to_end
;
158 sector_num
+= to_end
;
162 prev_end_off
+= to_end
;
168 static int64_t coroutine_fn GRAPH_RDLOCK
169 allocate_clusters(BlockDriverState
*bs
, int64_t sector_num
,
170 int nb_sectors
, int *pnum
)
173 BDRVParallelsState
*s
= bs
->opaque
;
174 int64_t pos
, space
, idx
, to_allocate
, i
, len
;
176 pos
= block_status(s
, sector_num
, nb_sectors
, pnum
);
181 idx
= sector_num
/ s
->tracks
;
182 to_allocate
= DIV_ROUND_UP(sector_num
+ *pnum
, s
->tracks
) - idx
;
184 /* This function is called only by parallels_co_writev(), which will never
185 * pass a sector_num at or beyond the end of the image (because the block
186 * layer never passes such a sector_num to that function). Therefore, idx
187 * is always below s->bat_size.
188 * block_status() will limit *pnum so that sector_num + *pnum will not
189 * exceed the image end. Therefore, idx + to_allocate cannot exceed
191 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate
192 * will always fit into a uint32_t. */
193 assert(idx
< s
->bat_size
&& idx
+ to_allocate
<= s
->bat_size
);
195 space
= to_allocate
* s
->tracks
;
196 len
= bdrv_getlength(bs
->file
->bs
);
200 if (s
->data_end
+ space
> (len
>> BDRV_SECTOR_BITS
)) {
201 space
+= s
->prealloc_size
;
203 * We require the expanded size to read back as zero. If the
204 * user permitted truncation, we try that; but if it fails, we
205 * force the safer-but-slower fallocate.
207 if (s
->prealloc_mode
== PRL_PREALLOC_MODE_TRUNCATE
) {
208 ret
= bdrv_co_truncate(bs
->file
,
209 (s
->data_end
+ space
) << BDRV_SECTOR_BITS
,
210 false, PREALLOC_MODE_OFF
,
211 BDRV_REQ_ZERO_WRITE
, NULL
);
212 if (ret
== -ENOTSUP
) {
213 s
->prealloc_mode
= PRL_PREALLOC_MODE_FALLOCATE
;
216 if (s
->prealloc_mode
== PRL_PREALLOC_MODE_FALLOCATE
) {
217 ret
= bdrv_co_pwrite_zeroes(bs
->file
,
218 s
->data_end
<< BDRV_SECTOR_BITS
,
219 space
<< BDRV_SECTOR_BITS
, 0);
226 /* Try to read from backing to fill empty clusters
227 * FIXME: 1. previous write_zeroes may be redundant
228 * 2. most of data we read from backing will be rewritten by
229 * parallels_co_writev. On aligned-to-cluster write we do not need
231 * 3. it would be good to combine write of data from backing and new
232 * data into one write call */
234 int64_t nb_cow_sectors
= to_allocate
* s
->tracks
;
235 int64_t nb_cow_bytes
= nb_cow_sectors
<< BDRV_SECTOR_BITS
;
236 void *buf
= qemu_blockalign(bs
, nb_cow_bytes
);
238 ret
= bdrv_co_pread(bs
->backing
, idx
* s
->tracks
* BDRV_SECTOR_SIZE
,
239 nb_cow_bytes
, buf
, 0);
245 ret
= bdrv_co_pwrite(bs
->file
, s
->data_end
* BDRV_SECTOR_SIZE
,
246 nb_cow_bytes
, buf
, 0);
253 for (i
= 0; i
< to_allocate
; i
++) {
254 s
->bat_bitmap
[idx
+ i
] = cpu_to_le32(s
->data_end
/ s
->off_multiplier
);
255 s
->data_end
+= s
->tracks
;
256 bitmap_set(s
->bat_dirty_bmap
,
257 bat_entry_off(idx
+ i
) / s
->bat_dirty_block
, 1);
260 return bat2sect(s
, idx
) + sector_num
% s
->tracks
;
264 static int coroutine_fn GRAPH_RDLOCK
265 parallels_co_flush_to_os(BlockDriverState
*bs
)
267 BDRVParallelsState
*s
= bs
->opaque
;
268 unsigned long size
= DIV_ROUND_UP(s
->header_size
, s
->bat_dirty_block
);
271 qemu_co_mutex_lock(&s
->lock
);
273 bit
= find_first_bit(s
->bat_dirty_bmap
, size
);
275 uint32_t off
= bit
* s
->bat_dirty_block
;
276 uint32_t to_write
= s
->bat_dirty_block
;
279 if (off
+ to_write
> s
->header_size
) {
280 to_write
= s
->header_size
- off
;
282 ret
= bdrv_co_pwrite(bs
->file
, off
, to_write
,
283 (uint8_t *)s
->header
+ off
, 0);
285 qemu_co_mutex_unlock(&s
->lock
);
288 bit
= find_next_bit(s
->bat_dirty_bmap
, size
, bit
+ 1);
290 bitmap_zero(s
->bat_dirty_bmap
, size
);
292 qemu_co_mutex_unlock(&s
->lock
);
297 static int coroutine_fn
parallels_co_block_status(BlockDriverState
*bs
,
303 BlockDriverState
**file
)
305 BDRVParallelsState
*s
= bs
->opaque
;
308 assert(QEMU_IS_ALIGNED(offset
| bytes
, BDRV_SECTOR_SIZE
));
309 qemu_co_mutex_lock(&s
->lock
);
310 offset
= block_status(s
, offset
>> BDRV_SECTOR_BITS
,
311 bytes
>> BDRV_SECTOR_BITS
, &count
);
312 qemu_co_mutex_unlock(&s
->lock
);
314 *pnum
= count
* BDRV_SECTOR_SIZE
;
319 *map
= offset
* BDRV_SECTOR_SIZE
;
320 *file
= bs
->file
->bs
;
321 return BDRV_BLOCK_DATA
| BDRV_BLOCK_OFFSET_VALID
;
324 static int coroutine_fn GRAPH_RDLOCK
325 parallels_co_writev(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
,
326 QEMUIOVector
*qiov
, int flags
)
328 BDRVParallelsState
*s
= bs
->opaque
;
329 uint64_t bytes_done
= 0;
330 QEMUIOVector hd_qiov
;
333 qemu_iovec_init(&hd_qiov
, qiov
->niov
);
335 while (nb_sectors
> 0) {
339 qemu_co_mutex_lock(&s
->lock
);
340 position
= allocate_clusters(bs
, sector_num
, nb_sectors
, &n
);
341 qemu_co_mutex_unlock(&s
->lock
);
347 nbytes
= n
<< BDRV_SECTOR_BITS
;
349 qemu_iovec_reset(&hd_qiov
);
350 qemu_iovec_concat(&hd_qiov
, qiov
, bytes_done
, nbytes
);
352 ret
= bdrv_co_pwritev(bs
->file
, position
* BDRV_SECTOR_SIZE
, nbytes
,
360 bytes_done
+= nbytes
;
363 qemu_iovec_destroy(&hd_qiov
);
367 static int coroutine_fn GRAPH_RDLOCK
368 parallels_co_readv(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
,
371 BDRVParallelsState
*s
= bs
->opaque
;
372 uint64_t bytes_done
= 0;
373 QEMUIOVector hd_qiov
;
376 qemu_iovec_init(&hd_qiov
, qiov
->niov
);
378 while (nb_sectors
> 0) {
382 qemu_co_mutex_lock(&s
->lock
);
383 position
= block_status(s
, sector_num
, nb_sectors
, &n
);
384 qemu_co_mutex_unlock(&s
->lock
);
386 nbytes
= n
<< BDRV_SECTOR_BITS
;
388 qemu_iovec_reset(&hd_qiov
);
389 qemu_iovec_concat(&hd_qiov
, qiov
, bytes_done
, nbytes
);
393 ret
= bdrv_co_preadv(bs
->backing
, sector_num
* BDRV_SECTOR_SIZE
,
394 nbytes
, &hd_qiov
, 0);
399 qemu_iovec_memset(&hd_qiov
, 0, 0, nbytes
);
402 ret
= bdrv_co_preadv(bs
->file
, position
* BDRV_SECTOR_SIZE
, nbytes
,
411 bytes_done
+= nbytes
;
414 qemu_iovec_destroy(&hd_qiov
);
419 static int coroutine_fn GRAPH_RDLOCK
420 parallels_co_check(BlockDriverState
*bs
, BdrvCheckResult
*res
,
423 BDRVParallelsState
*s
= bs
->opaque
;
424 int64_t size
, prev_off
, high_off
;
427 bool flush_bat
= false;
429 size
= bdrv_getlength(bs
->file
->bs
);
435 qemu_co_mutex_lock(&s
->lock
);
436 if (s
->header_unclean
) {
437 fprintf(stderr
, "%s image was not closed correctly\n",
438 fix
& BDRV_FIX_ERRORS
? "Repairing" : "ERROR");
440 if (fix
& BDRV_FIX_ERRORS
) {
441 /* parallels_close will do the job right */
442 res
->corruptions_fixed
++;
443 s
->header_unclean
= false;
447 res
->bfi
.total_clusters
= s
->bat_size
;
448 res
->bfi
.compressed_clusters
= 0; /* compression is not supported */
452 for (i
= 0; i
< s
->bat_size
; i
++) {
453 int64_t off
= bat2sect(s
, i
) << BDRV_SECTOR_BITS
;
459 /* cluster outside the image */
461 fprintf(stderr
, "%s cluster %u is outside image\n",
462 fix
& BDRV_FIX_ERRORS
? "Repairing" : "ERROR", i
);
464 if (fix
& BDRV_FIX_ERRORS
) {
466 s
->bat_bitmap
[i
] = 0;
467 res
->corruptions_fixed
++;
473 res
->bfi
.allocated_clusters
++;
474 if (off
> high_off
) {
478 if (prev_off
!= 0 && (prev_off
+ s
->cluster_size
) != off
) {
479 res
->bfi
.fragmented_clusters
++;
486 ret
= bdrv_co_pwrite_sync(bs
->file
, 0, s
->header_size
, s
->header
, 0);
493 res
->image_end_offset
= high_off
+ s
->cluster_size
;
494 if (size
> res
->image_end_offset
) {
496 count
= DIV_ROUND_UP(size
- res
->image_end_offset
, s
->cluster_size
);
497 fprintf(stderr
, "%s space leaked at the end of the image %" PRId64
"\n",
498 fix
& BDRV_FIX_LEAKS
? "Repairing" : "ERROR",
499 size
- res
->image_end_offset
);
501 if (fix
& BDRV_FIX_LEAKS
) {
502 Error
*local_err
= NULL
;
505 * In order to really repair the image, we must shrink it.
506 * That means we have to pass exact=true.
508 ret
= bdrv_co_truncate(bs
->file
, res
->image_end_offset
, true,
509 PREALLOC_MODE_OFF
, 0, &local_err
);
511 error_report_err(local_err
);
515 res
->leaks_fixed
+= count
;
520 qemu_co_mutex_unlock(&s
->lock
);
525 static int coroutine_fn GRAPH_UNLOCKED
526 parallels_co_create(BlockdevCreateOptions
* opts
, Error
**errp
)
528 BlockdevCreateOptionsParallels
*parallels_opts
;
529 BlockDriverState
*bs
;
531 int64_t total_size
, cl_size
;
532 uint32_t bat_entries
, bat_sectors
;
533 ParallelsHeader header
;
534 uint8_t tmp
[BDRV_SECTOR_SIZE
];
537 assert(opts
->driver
== BLOCKDEV_DRIVER_PARALLELS
);
538 parallels_opts
= &opts
->u
.parallels
;
541 total_size
= parallels_opts
->size
;
543 if (parallels_opts
->has_cluster_size
) {
544 cl_size
= parallels_opts
->cluster_size
;
546 cl_size
= DEFAULT_CLUSTER_SIZE
;
549 /* XXX What is the real limit here? This is an insanely large maximum. */
550 if (cl_size
>= INT64_MAX
/ MAX_PARALLELS_IMAGE_FACTOR
) {
551 error_setg(errp
, "Cluster size is too large");
554 if (total_size
>= MAX_PARALLELS_IMAGE_FACTOR
* cl_size
) {
555 error_setg(errp
, "Image size is too large for this cluster size");
559 if (!QEMU_IS_ALIGNED(total_size
, BDRV_SECTOR_SIZE
)) {
560 error_setg(errp
, "Image size must be a multiple of 512 bytes");
564 if (!QEMU_IS_ALIGNED(cl_size
, BDRV_SECTOR_SIZE
)) {
565 error_setg(errp
, "Cluster size must be a multiple of 512 bytes");
569 /* Create BlockBackend to write to the image */
570 bs
= bdrv_co_open_blockdev_ref(parallels_opts
->file
, errp
);
575 blk
= blk_co_new_with_bs(bs
, BLK_PERM_WRITE
| BLK_PERM_RESIZE
, BLK_PERM_ALL
,
581 blk_set_allow_write_beyond_eof(blk
, true);
583 /* Create image format */
584 bat_entries
= DIV_ROUND_UP(total_size
, cl_size
);
585 bat_sectors
= DIV_ROUND_UP(bat_entry_off(bat_entries
), cl_size
);
586 bat_sectors
= (bat_sectors
* cl_size
) >> BDRV_SECTOR_BITS
;
588 memset(&header
, 0, sizeof(header
));
589 memcpy(header
.magic
, HEADER_MAGIC2
, sizeof(header
.magic
));
590 header
.version
= cpu_to_le32(HEADER_VERSION
);
591 /* don't care much about geometry, it is not used on image level */
592 header
.heads
= cpu_to_le32(HEADS_NUMBER
);
593 header
.cylinders
= cpu_to_le32(total_size
/ BDRV_SECTOR_SIZE
594 / HEADS_NUMBER
/ SEC_IN_CYL
);
595 header
.tracks
= cpu_to_le32(cl_size
>> BDRV_SECTOR_BITS
);
596 header
.bat_entries
= cpu_to_le32(bat_entries
);
597 header
.nb_sectors
= cpu_to_le64(DIV_ROUND_UP(total_size
, BDRV_SECTOR_SIZE
));
598 header
.data_off
= cpu_to_le32(bat_sectors
);
600 /* write all the data */
601 memset(tmp
, 0, sizeof(tmp
));
602 memcpy(tmp
, &header
, sizeof(header
));
604 ret
= blk_co_pwrite(blk
, 0, BDRV_SECTOR_SIZE
, tmp
, 0);
608 ret
= blk_co_pwrite_zeroes(blk
, BDRV_SECTOR_SIZE
,
609 (bat_sectors
- 1) << BDRV_SECTOR_BITS
, 0);
621 error_setg_errno(errp
, -ret
, "Failed to create Parallels image");
625 static int coroutine_fn GRAPH_UNLOCKED
626 parallels_co_create_opts(BlockDriver
*drv
, const char *filename
,
627 QemuOpts
*opts
, Error
**errp
)
629 BlockdevCreateOptions
*create_options
= NULL
;
630 BlockDriverState
*bs
= NULL
;
635 static const QDictRenames opt_renames
[] = {
636 { BLOCK_OPT_CLUSTER_SIZE
, "cluster-size" },
640 /* Parse options and convert legacy syntax */
641 qdict
= qemu_opts_to_qdict_filtered(opts
, NULL
, ¶llels_create_opts
,
644 if (!qdict_rename_keys(qdict
, opt_renames
, errp
)) {
649 /* Create and open the file (protocol layer) */
650 ret
= bdrv_co_create_file(filename
, opts
, errp
);
655 bs
= bdrv_co_open(filename
, NULL
, NULL
,
656 BDRV_O_RDWR
| BDRV_O_RESIZE
| BDRV_O_PROTOCOL
, errp
);
662 /* Now get the QAPI type BlockdevCreateOptions */
663 qdict_put_str(qdict
, "driver", "parallels");
664 qdict_put_str(qdict
, "file", bs
->node_name
);
666 v
= qobject_input_visitor_new_flat_confused(qdict
, errp
);
672 visit_type_BlockdevCreateOptions(v
, NULL
, &create_options
, errp
);
674 if (!create_options
) {
679 /* Silently round up sizes */
680 create_options
->u
.parallels
.size
=
681 ROUND_UP(create_options
->u
.parallels
.size
, BDRV_SECTOR_SIZE
);
682 create_options
->u
.parallels
.cluster_size
=
683 ROUND_UP(create_options
->u
.parallels
.cluster_size
, BDRV_SECTOR_SIZE
);
685 /* Create the Parallels image (format layer) */
686 ret
= parallels_co_create(create_options
, errp
);
693 qobject_unref(qdict
);
695 qapi_free_BlockdevCreateOptions(create_options
);
700 static int parallels_probe(const uint8_t *buf
, int buf_size
,
701 const char *filename
)
703 const ParallelsHeader
*ph
= (const void *)buf
;
705 if (buf_size
< sizeof(ParallelsHeader
)) {
709 if ((!memcmp(ph
->magic
, HEADER_MAGIC
, 16) ||
710 !memcmp(ph
->magic
, HEADER_MAGIC2
, 16)) &&
711 (le32_to_cpu(ph
->version
) == HEADER_VERSION
)) {
718 static int parallels_update_header(BlockDriverState
*bs
)
720 BDRVParallelsState
*s
= bs
->opaque
;
721 unsigned size
= MAX(bdrv_opt_mem_align(bs
->file
->bs
),
722 sizeof(ParallelsHeader
));
724 if (size
> s
->header_size
) {
725 size
= s
->header_size
;
727 return bdrv_pwrite_sync(bs
->file
, 0, size
, s
->header
, 0);
730 static int parallels_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
733 BDRVParallelsState
*s
= bs
->opaque
;
736 QemuOpts
*opts
= NULL
;
737 Error
*local_err
= NULL
;
740 ret
= bdrv_open_file_child(NULL
, options
, "file", bs
, errp
);
745 ret
= bdrv_pread(bs
->file
, 0, sizeof(ph
), &ph
, 0);
750 bs
->total_sectors
= le64_to_cpu(ph
.nb_sectors
);
752 if (le32_to_cpu(ph
.version
) != HEADER_VERSION
) {
755 if (!memcmp(ph
.magic
, HEADER_MAGIC
, 16)) {
756 s
->off_multiplier
= 1;
757 bs
->total_sectors
= 0xffffffff & bs
->total_sectors
;
758 } else if (!memcmp(ph
.magic
, HEADER_MAGIC2
, 16)) {
759 s
->off_multiplier
= le32_to_cpu(ph
.tracks
);
764 s
->tracks
= le32_to_cpu(ph
.tracks
);
765 if (s
->tracks
== 0) {
766 error_setg(errp
, "Invalid image: Zero sectors per track");
770 if (s
->tracks
> INT32_MAX
/513) {
771 error_setg(errp
, "Invalid image: Too big cluster");
775 s
->cluster_size
= s
->tracks
<< BDRV_SECTOR_BITS
;
777 s
->bat_size
= le32_to_cpu(ph
.bat_entries
);
778 if (s
->bat_size
> INT_MAX
/ sizeof(uint32_t)) {
779 error_setg(errp
, "Catalog too large");
784 size
= bat_entry_off(s
->bat_size
);
785 s
->header_size
= ROUND_UP(size
, bdrv_opt_mem_align(bs
->file
->bs
));
786 s
->header
= qemu_try_blockalign(bs
->file
->bs
, s
->header_size
);
787 if (s
->header
== NULL
) {
791 s
->data_end
= le32_to_cpu(ph
.data_off
);
792 if (s
->data_end
== 0) {
793 s
->data_end
= ROUND_UP(bat_entry_off(s
->bat_size
), BDRV_SECTOR_SIZE
);
795 if (s
->data_end
< s
->header_size
) {
796 /* there is not enough unused space to fit to block align between BAT
797 and actual data. We can't avoid read-modify-write... */
798 s
->header_size
= size
;
801 ret
= bdrv_pread(bs
->file
, 0, s
->header_size
, s
->header
, 0);
805 s
->bat_bitmap
= (uint32_t *)(s
->header
+ 1);
807 for (i
= 0; i
< s
->bat_size
; i
++) {
808 int64_t off
= bat2sect(s
, i
);
809 if (off
>= s
->data_end
) {
810 s
->data_end
= off
+ s
->tracks
;
814 if (le32_to_cpu(ph
.inuse
) == HEADER_INUSE_MAGIC
) {
815 /* Image was not closed correctly. The check is mandatory */
816 s
->header_unclean
= true;
817 if ((flags
& BDRV_O_RDWR
) && !(flags
& BDRV_O_CHECK
)) {
818 error_setg(errp
, "parallels: Image was not closed correctly; "
819 "cannot be opened read/write");
825 opts
= qemu_opts_create(¶llels_runtime_opts
, NULL
, 0, errp
);
830 if (!qemu_opts_absorb_qdict(opts
, options
, errp
)) {
835 qemu_opt_get_size_del(opts
, PARALLELS_OPT_PREALLOC_SIZE
, 0);
836 s
->prealloc_size
= MAX(s
->tracks
, s
->prealloc_size
>> BDRV_SECTOR_BITS
);
837 buf
= qemu_opt_get_del(opts
, PARALLELS_OPT_PREALLOC_MODE
);
838 /* prealloc_mode can be downgraded later during allocate_clusters */
839 s
->prealloc_mode
= qapi_enum_parse(&prealloc_mode_lookup
, buf
,
840 PRL_PREALLOC_MODE_FALLOCATE
,
843 if (local_err
!= NULL
) {
844 error_propagate(errp
, local_err
);
849 if (flags
& BDRV_O_RDWR
) {
851 * It's unsafe to open image RW if there is an extension (as we
852 * don't support it). But parallels driver in QEMU historically
853 * ignores the extension, so print warning and don't care.
855 warn_report("Format Extension ignored in RW mode");
857 ret
= parallels_read_format_extension(
858 bs
, le64_to_cpu(ph
.ext_off
) << BDRV_SECTOR_BITS
, errp
);
865 if ((flags
& BDRV_O_RDWR
) && !(flags
& BDRV_O_INACTIVE
)) {
866 s
->header
->inuse
= cpu_to_le32(HEADER_INUSE_MAGIC
);
867 ret
= parallels_update_header(bs
);
873 s
->bat_dirty_block
= 4 * qemu_real_host_page_size();
875 bitmap_new(DIV_ROUND_UP(s
->header_size
, s
->bat_dirty_block
));
877 /* Disable migration until bdrv_activate method is added */
878 error_setg(&s
->migration_blocker
, "The Parallels format used by node '%s' "
879 "does not support live migration",
880 bdrv_get_device_or_node_name(bs
));
881 ret
= migrate_add_blocker(s
->migration_blocker
, errp
);
883 error_free(s
->migration_blocker
);
886 qemu_co_mutex_init(&s
->lock
);
890 error_setg(errp
, "Image not in Parallels format");
894 qemu_vfree(s
->header
);
899 static void parallels_close(BlockDriverState
*bs
)
901 BDRVParallelsState
*s
= bs
->opaque
;
903 if ((bs
->open_flags
& BDRV_O_RDWR
) && !(bs
->open_flags
& BDRV_O_INACTIVE
)) {
904 s
->header
->inuse
= 0;
905 parallels_update_header(bs
);
907 /* errors are ignored, so we might as well pass exact=true */
908 bdrv_truncate(bs
->file
, s
->data_end
<< BDRV_SECTOR_BITS
, true,
909 PREALLOC_MODE_OFF
, 0, NULL
);
912 g_free(s
->bat_dirty_bmap
);
913 qemu_vfree(s
->header
);
915 migrate_del_blocker(s
->migration_blocker
);
916 error_free(s
->migration_blocker
);
919 static BlockDriver bdrv_parallels
= {
920 .format_name
= "parallels",
921 .instance_size
= sizeof(BDRVParallelsState
),
922 .bdrv_probe
= parallels_probe
,
923 .bdrv_open
= parallels_open
,
924 .bdrv_close
= parallels_close
,
925 .bdrv_child_perm
= bdrv_default_perms
,
926 .bdrv_co_block_status
= parallels_co_block_status
,
927 .bdrv_has_zero_init
= bdrv_has_zero_init_1
,
928 .bdrv_co_flush_to_os
= parallels_co_flush_to_os
,
929 .bdrv_co_readv
= parallels_co_readv
,
930 .bdrv_co_writev
= parallels_co_writev
,
932 .supports_backing
= true,
933 .bdrv_co_create
= parallels_co_create
,
934 .bdrv_co_create_opts
= parallels_co_create_opts
,
935 .bdrv_co_check
= parallels_co_check
,
936 .create_opts
= ¶llels_create_opts
,
939 static void bdrv_parallels_init(void)
941 bdrv_register(&bdrv_parallels
);
944 block_init(bdrv_parallels_init
);