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 void parallels_set_bat_entry(BDRVParallelsState
*s
,
169 uint32_t index
, uint32_t offset
)
171 s
->bat_bitmap
[index
] = cpu_to_le32(offset
);
172 bitmap_set(s
->bat_dirty_bmap
, bat_entry_off(index
) / s
->bat_dirty_block
, 1);
175 static int64_t coroutine_fn GRAPH_RDLOCK
176 allocate_clusters(BlockDriverState
*bs
, int64_t sector_num
,
177 int nb_sectors
, int *pnum
)
180 BDRVParallelsState
*s
= bs
->opaque
;
181 int64_t pos
, space
, idx
, to_allocate
, i
, len
;
183 pos
= block_status(s
, sector_num
, nb_sectors
, pnum
);
188 idx
= sector_num
/ s
->tracks
;
189 to_allocate
= DIV_ROUND_UP(sector_num
+ *pnum
, s
->tracks
) - idx
;
191 /* This function is called only by parallels_co_writev(), which will never
192 * pass a sector_num at or beyond the end of the image (because the block
193 * layer never passes such a sector_num to that function). Therefore, idx
194 * is always below s->bat_size.
195 * block_status() will limit *pnum so that sector_num + *pnum will not
196 * exceed the image end. Therefore, idx + to_allocate cannot exceed
198 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate
199 * will always fit into a uint32_t. */
200 assert(idx
< s
->bat_size
&& idx
+ to_allocate
<= s
->bat_size
);
202 space
= to_allocate
* s
->tracks
;
203 len
= bdrv_getlength(bs
->file
->bs
);
207 if (s
->data_end
+ space
> (len
>> BDRV_SECTOR_BITS
)) {
208 space
+= s
->prealloc_size
;
210 * We require the expanded size to read back as zero. If the
211 * user permitted truncation, we try that; but if it fails, we
212 * force the safer-but-slower fallocate.
214 if (s
->prealloc_mode
== PRL_PREALLOC_MODE_TRUNCATE
) {
215 ret
= bdrv_co_truncate(bs
->file
,
216 (s
->data_end
+ space
) << BDRV_SECTOR_BITS
,
217 false, PREALLOC_MODE_OFF
,
218 BDRV_REQ_ZERO_WRITE
, NULL
);
219 if (ret
== -ENOTSUP
) {
220 s
->prealloc_mode
= PRL_PREALLOC_MODE_FALLOCATE
;
223 if (s
->prealloc_mode
== PRL_PREALLOC_MODE_FALLOCATE
) {
224 ret
= bdrv_co_pwrite_zeroes(bs
->file
,
225 s
->data_end
<< BDRV_SECTOR_BITS
,
226 space
<< BDRV_SECTOR_BITS
, 0);
233 /* Try to read from backing to fill empty clusters
234 * FIXME: 1. previous write_zeroes may be redundant
235 * 2. most of data we read from backing will be rewritten by
236 * parallels_co_writev. On aligned-to-cluster write we do not need
238 * 3. it would be good to combine write of data from backing and new
239 * data into one write call */
241 int64_t nb_cow_sectors
= to_allocate
* s
->tracks
;
242 int64_t nb_cow_bytes
= nb_cow_sectors
<< BDRV_SECTOR_BITS
;
243 void *buf
= qemu_blockalign(bs
, nb_cow_bytes
);
245 ret
= bdrv_co_pread(bs
->backing
, idx
* s
->tracks
* BDRV_SECTOR_SIZE
,
246 nb_cow_bytes
, buf
, 0);
252 ret
= bdrv_co_pwrite(bs
->file
, s
->data_end
* BDRV_SECTOR_SIZE
,
253 nb_cow_bytes
, buf
, 0);
260 for (i
= 0; i
< to_allocate
; i
++) {
261 parallels_set_bat_entry(s
, idx
+ i
, s
->data_end
/ s
->off_multiplier
);
262 s
->data_end
+= s
->tracks
;
265 return bat2sect(s
, idx
) + sector_num
% s
->tracks
;
269 static int coroutine_fn GRAPH_RDLOCK
270 parallels_co_flush_to_os(BlockDriverState
*bs
)
272 BDRVParallelsState
*s
= bs
->opaque
;
273 unsigned long size
= DIV_ROUND_UP(s
->header_size
, s
->bat_dirty_block
);
276 qemu_co_mutex_lock(&s
->lock
);
278 bit
= find_first_bit(s
->bat_dirty_bmap
, size
);
280 uint32_t off
= bit
* s
->bat_dirty_block
;
281 uint32_t to_write
= s
->bat_dirty_block
;
284 if (off
+ to_write
> s
->header_size
) {
285 to_write
= s
->header_size
- off
;
287 ret
= bdrv_co_pwrite(bs
->file
, off
, to_write
,
288 (uint8_t *)s
->header
+ off
, 0);
290 qemu_co_mutex_unlock(&s
->lock
);
293 bit
= find_next_bit(s
->bat_dirty_bmap
, size
, bit
+ 1);
295 bitmap_zero(s
->bat_dirty_bmap
, size
);
297 qemu_co_mutex_unlock(&s
->lock
);
302 static int coroutine_fn
parallels_co_block_status(BlockDriverState
*bs
,
308 BlockDriverState
**file
)
310 BDRVParallelsState
*s
= bs
->opaque
;
313 assert(QEMU_IS_ALIGNED(offset
| bytes
, BDRV_SECTOR_SIZE
));
314 qemu_co_mutex_lock(&s
->lock
);
315 offset
= block_status(s
, offset
>> BDRV_SECTOR_BITS
,
316 bytes
>> BDRV_SECTOR_BITS
, &count
);
317 qemu_co_mutex_unlock(&s
->lock
);
319 *pnum
= count
* BDRV_SECTOR_SIZE
;
324 *map
= offset
* BDRV_SECTOR_SIZE
;
325 *file
= bs
->file
->bs
;
326 return BDRV_BLOCK_DATA
| BDRV_BLOCK_OFFSET_VALID
;
329 static int coroutine_fn GRAPH_RDLOCK
330 parallels_co_writev(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
,
331 QEMUIOVector
*qiov
, int flags
)
333 BDRVParallelsState
*s
= bs
->opaque
;
334 uint64_t bytes_done
= 0;
335 QEMUIOVector hd_qiov
;
338 qemu_iovec_init(&hd_qiov
, qiov
->niov
);
340 while (nb_sectors
> 0) {
344 qemu_co_mutex_lock(&s
->lock
);
345 position
= allocate_clusters(bs
, sector_num
, nb_sectors
, &n
);
346 qemu_co_mutex_unlock(&s
->lock
);
352 nbytes
= n
<< BDRV_SECTOR_BITS
;
354 qemu_iovec_reset(&hd_qiov
);
355 qemu_iovec_concat(&hd_qiov
, qiov
, bytes_done
, nbytes
);
357 ret
= bdrv_co_pwritev(bs
->file
, position
* BDRV_SECTOR_SIZE
, nbytes
,
365 bytes_done
+= nbytes
;
368 qemu_iovec_destroy(&hd_qiov
);
372 static int coroutine_fn GRAPH_RDLOCK
373 parallels_co_readv(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
,
376 BDRVParallelsState
*s
= bs
->opaque
;
377 uint64_t bytes_done
= 0;
378 QEMUIOVector hd_qiov
;
381 qemu_iovec_init(&hd_qiov
, qiov
->niov
);
383 while (nb_sectors
> 0) {
387 qemu_co_mutex_lock(&s
->lock
);
388 position
= block_status(s
, sector_num
, nb_sectors
, &n
);
389 qemu_co_mutex_unlock(&s
->lock
);
391 nbytes
= n
<< BDRV_SECTOR_BITS
;
393 qemu_iovec_reset(&hd_qiov
);
394 qemu_iovec_concat(&hd_qiov
, qiov
, bytes_done
, nbytes
);
398 ret
= bdrv_co_preadv(bs
->backing
, sector_num
* BDRV_SECTOR_SIZE
,
399 nbytes
, &hd_qiov
, 0);
404 qemu_iovec_memset(&hd_qiov
, 0, 0, nbytes
);
407 ret
= bdrv_co_preadv(bs
->file
, position
* BDRV_SECTOR_SIZE
, nbytes
,
416 bytes_done
+= nbytes
;
419 qemu_iovec_destroy(&hd_qiov
);
424 static int coroutine_fn GRAPH_RDLOCK
425 parallels_co_check(BlockDriverState
*bs
, BdrvCheckResult
*res
,
428 BDRVParallelsState
*s
= bs
->opaque
;
429 int64_t size
, prev_off
, high_off
;
432 bool flush_bat
= false;
434 size
= bdrv_getlength(bs
->file
->bs
);
440 qemu_co_mutex_lock(&s
->lock
);
441 if (s
->header_unclean
) {
442 fprintf(stderr
, "%s image was not closed correctly\n",
443 fix
& BDRV_FIX_ERRORS
? "Repairing" : "ERROR");
445 if (fix
& BDRV_FIX_ERRORS
) {
446 /* parallels_close will do the job right */
447 res
->corruptions_fixed
++;
448 s
->header_unclean
= false;
452 res
->bfi
.total_clusters
= s
->bat_size
;
453 res
->bfi
.compressed_clusters
= 0; /* compression is not supported */
457 for (i
= 0; i
< s
->bat_size
; i
++) {
458 int64_t off
= bat2sect(s
, i
) << BDRV_SECTOR_BITS
;
464 /* cluster outside the image */
466 fprintf(stderr
, "%s cluster %u is outside image\n",
467 fix
& BDRV_FIX_ERRORS
? "Repairing" : "ERROR", i
);
469 if (fix
& BDRV_FIX_ERRORS
) {
470 s
->bat_bitmap
[i
] = 0;
471 res
->corruptions_fixed
++;
478 res
->bfi
.allocated_clusters
++;
479 if (off
> high_off
) {
483 if (prev_off
!= 0 && (prev_off
+ s
->cluster_size
) != off
) {
484 res
->bfi
.fragmented_clusters
++;
491 ret
= bdrv_co_pwrite_sync(bs
->file
, 0, s
->header_size
, s
->header
, 0);
499 res
->image_end_offset
= s
->data_end
<< BDRV_SECTOR_BITS
;
501 res
->image_end_offset
= high_off
+ s
->cluster_size
;
502 s
->data_end
= res
->image_end_offset
>> BDRV_SECTOR_BITS
;
505 if (size
> res
->image_end_offset
) {
507 count
= DIV_ROUND_UP(size
- res
->image_end_offset
, s
->cluster_size
);
508 fprintf(stderr
, "%s space leaked at the end of the image %" PRId64
"\n",
509 fix
& BDRV_FIX_LEAKS
? "Repairing" : "ERROR",
510 size
- res
->image_end_offset
);
512 if (fix
& BDRV_FIX_LEAKS
) {
513 Error
*local_err
= NULL
;
516 * In order to really repair the image, we must shrink it.
517 * That means we have to pass exact=true.
519 ret
= bdrv_co_truncate(bs
->file
, res
->image_end_offset
, true,
520 PREALLOC_MODE_OFF
, 0, &local_err
);
522 error_report_err(local_err
);
526 res
->leaks_fixed
+= count
;
531 qemu_co_mutex_unlock(&s
->lock
);
536 static int coroutine_fn GRAPH_UNLOCKED
537 parallels_co_create(BlockdevCreateOptions
* opts
, Error
**errp
)
539 BlockdevCreateOptionsParallels
*parallels_opts
;
540 BlockDriverState
*bs
;
542 int64_t total_size
, cl_size
;
543 uint32_t bat_entries
, bat_sectors
;
544 ParallelsHeader header
;
545 uint8_t tmp
[BDRV_SECTOR_SIZE
];
548 assert(opts
->driver
== BLOCKDEV_DRIVER_PARALLELS
);
549 parallels_opts
= &opts
->u
.parallels
;
552 total_size
= parallels_opts
->size
;
554 if (parallels_opts
->has_cluster_size
) {
555 cl_size
= parallels_opts
->cluster_size
;
557 cl_size
= DEFAULT_CLUSTER_SIZE
;
560 /* XXX What is the real limit here? This is an insanely large maximum. */
561 if (cl_size
>= INT64_MAX
/ MAX_PARALLELS_IMAGE_FACTOR
) {
562 error_setg(errp
, "Cluster size is too large");
565 if (total_size
>= MAX_PARALLELS_IMAGE_FACTOR
* cl_size
) {
566 error_setg(errp
, "Image size is too large for this cluster size");
570 if (!QEMU_IS_ALIGNED(total_size
, BDRV_SECTOR_SIZE
)) {
571 error_setg(errp
, "Image size must be a multiple of 512 bytes");
575 if (!QEMU_IS_ALIGNED(cl_size
, BDRV_SECTOR_SIZE
)) {
576 error_setg(errp
, "Cluster size must be a multiple of 512 bytes");
580 /* Create BlockBackend to write to the image */
581 bs
= bdrv_co_open_blockdev_ref(parallels_opts
->file
, errp
);
586 blk
= blk_co_new_with_bs(bs
, BLK_PERM_WRITE
| BLK_PERM_RESIZE
, BLK_PERM_ALL
,
592 blk_set_allow_write_beyond_eof(blk
, true);
594 /* Create image format */
595 bat_entries
= DIV_ROUND_UP(total_size
, cl_size
);
596 bat_sectors
= DIV_ROUND_UP(bat_entry_off(bat_entries
), cl_size
);
597 bat_sectors
= (bat_sectors
* cl_size
) >> BDRV_SECTOR_BITS
;
599 memset(&header
, 0, sizeof(header
));
600 memcpy(header
.magic
, HEADER_MAGIC2
, sizeof(header
.magic
));
601 header
.version
= cpu_to_le32(HEADER_VERSION
);
602 /* don't care much about geometry, it is not used on image level */
603 header
.heads
= cpu_to_le32(HEADS_NUMBER
);
604 header
.cylinders
= cpu_to_le32(total_size
/ BDRV_SECTOR_SIZE
605 / HEADS_NUMBER
/ SEC_IN_CYL
);
606 header
.tracks
= cpu_to_le32(cl_size
>> BDRV_SECTOR_BITS
);
607 header
.bat_entries
= cpu_to_le32(bat_entries
);
608 header
.nb_sectors
= cpu_to_le64(DIV_ROUND_UP(total_size
, BDRV_SECTOR_SIZE
));
609 header
.data_off
= cpu_to_le32(bat_sectors
);
611 /* write all the data */
612 memset(tmp
, 0, sizeof(tmp
));
613 memcpy(tmp
, &header
, sizeof(header
));
615 ret
= blk_co_pwrite(blk
, 0, BDRV_SECTOR_SIZE
, tmp
, 0);
619 ret
= blk_co_pwrite_zeroes(blk
, BDRV_SECTOR_SIZE
,
620 (bat_sectors
- 1) << BDRV_SECTOR_BITS
, 0);
632 error_setg_errno(errp
, -ret
, "Failed to create Parallels image");
636 static int coroutine_fn GRAPH_UNLOCKED
637 parallels_co_create_opts(BlockDriver
*drv
, const char *filename
,
638 QemuOpts
*opts
, Error
**errp
)
640 BlockdevCreateOptions
*create_options
= NULL
;
641 BlockDriverState
*bs
= NULL
;
646 static const QDictRenames opt_renames
[] = {
647 { BLOCK_OPT_CLUSTER_SIZE
, "cluster-size" },
651 /* Parse options and convert legacy syntax */
652 qdict
= qemu_opts_to_qdict_filtered(opts
, NULL
, ¶llels_create_opts
,
655 if (!qdict_rename_keys(qdict
, opt_renames
, errp
)) {
660 /* Create and open the file (protocol layer) */
661 ret
= bdrv_co_create_file(filename
, opts
, errp
);
666 bs
= bdrv_co_open(filename
, NULL
, NULL
,
667 BDRV_O_RDWR
| BDRV_O_RESIZE
| BDRV_O_PROTOCOL
, errp
);
673 /* Now get the QAPI type BlockdevCreateOptions */
674 qdict_put_str(qdict
, "driver", "parallels");
675 qdict_put_str(qdict
, "file", bs
->node_name
);
677 v
= qobject_input_visitor_new_flat_confused(qdict
, errp
);
683 visit_type_BlockdevCreateOptions(v
, NULL
, &create_options
, errp
);
685 if (!create_options
) {
690 /* Silently round up sizes */
691 create_options
->u
.parallels
.size
=
692 ROUND_UP(create_options
->u
.parallels
.size
, BDRV_SECTOR_SIZE
);
693 create_options
->u
.parallels
.cluster_size
=
694 ROUND_UP(create_options
->u
.parallels
.cluster_size
, BDRV_SECTOR_SIZE
);
696 /* Create the Parallels image (format layer) */
697 ret
= parallels_co_create(create_options
, errp
);
704 qobject_unref(qdict
);
706 qapi_free_BlockdevCreateOptions(create_options
);
711 static int parallels_probe(const uint8_t *buf
, int buf_size
,
712 const char *filename
)
714 const ParallelsHeader
*ph
= (const void *)buf
;
716 if (buf_size
< sizeof(ParallelsHeader
)) {
720 if ((!memcmp(ph
->magic
, HEADER_MAGIC
, 16) ||
721 !memcmp(ph
->magic
, HEADER_MAGIC2
, 16)) &&
722 (le32_to_cpu(ph
->version
) == HEADER_VERSION
)) {
729 static int parallels_update_header(BlockDriverState
*bs
)
731 BDRVParallelsState
*s
= bs
->opaque
;
732 unsigned size
= MAX(bdrv_opt_mem_align(bs
->file
->bs
),
733 sizeof(ParallelsHeader
));
735 if (size
> s
->header_size
) {
736 size
= s
->header_size
;
738 return bdrv_pwrite_sync(bs
->file
, 0, size
, s
->header
, 0);
741 static int parallels_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
744 BDRVParallelsState
*s
= bs
->opaque
;
747 int64_t file_nb_sectors
;
748 QemuOpts
*opts
= NULL
;
749 Error
*local_err
= NULL
;
752 ret
= bdrv_open_file_child(NULL
, options
, "file", bs
, errp
);
757 file_nb_sectors
= bdrv_nb_sectors(bs
->file
->bs
);
758 if (file_nb_sectors
< 0) {
762 ret
= bdrv_pread(bs
->file
, 0, sizeof(ph
), &ph
, 0);
767 bs
->total_sectors
= le64_to_cpu(ph
.nb_sectors
);
769 if (le32_to_cpu(ph
.version
) != HEADER_VERSION
) {
772 if (!memcmp(ph
.magic
, HEADER_MAGIC
, 16)) {
773 s
->off_multiplier
= 1;
774 bs
->total_sectors
= 0xffffffff & bs
->total_sectors
;
775 } else if (!memcmp(ph
.magic
, HEADER_MAGIC2
, 16)) {
776 s
->off_multiplier
= le32_to_cpu(ph
.tracks
);
781 s
->tracks
= le32_to_cpu(ph
.tracks
);
782 if (s
->tracks
== 0) {
783 error_setg(errp
, "Invalid image: Zero sectors per track");
787 if (s
->tracks
> INT32_MAX
/513) {
788 error_setg(errp
, "Invalid image: Too big cluster");
792 s
->cluster_size
= s
->tracks
<< BDRV_SECTOR_BITS
;
794 s
->bat_size
= le32_to_cpu(ph
.bat_entries
);
795 if (s
->bat_size
> INT_MAX
/ sizeof(uint32_t)) {
796 error_setg(errp
, "Catalog too large");
801 size
= bat_entry_off(s
->bat_size
);
802 s
->header_size
= ROUND_UP(size
, bdrv_opt_mem_align(bs
->file
->bs
));
803 s
->header
= qemu_try_blockalign(bs
->file
->bs
, s
->header_size
);
804 if (s
->header
== NULL
) {
808 s
->data_end
= le32_to_cpu(ph
.data_off
);
809 if (s
->data_end
== 0) {
810 s
->data_end
= ROUND_UP(bat_entry_off(s
->bat_size
), BDRV_SECTOR_SIZE
);
812 if (s
->data_end
< s
->header_size
) {
813 /* there is not enough unused space to fit to block align between BAT
814 and actual data. We can't avoid read-modify-write... */
815 s
->header_size
= size
;
818 ret
= bdrv_pread(bs
->file
, 0, s
->header_size
, s
->header
, 0);
822 s
->bat_bitmap
= (uint32_t *)(s
->header
+ 1);
824 for (i
= 0; i
< s
->bat_size
; i
++) {
825 int64_t off
= bat2sect(s
, i
);
826 if (off
>= file_nb_sectors
) {
827 if (flags
& BDRV_O_CHECK
) {
830 error_setg(errp
, "parallels: Offset %" PRIi64
" in BAT[%d] entry "
831 "is larger than file size (%" PRIi64
")",
832 off
<< BDRV_SECTOR_BITS
, i
,
833 file_nb_sectors
<< BDRV_SECTOR_BITS
);
837 if (off
>= s
->data_end
) {
838 s
->data_end
= off
+ s
->tracks
;
842 if (le32_to_cpu(ph
.inuse
) == HEADER_INUSE_MAGIC
) {
843 /* Image was not closed correctly. The check is mandatory */
844 s
->header_unclean
= true;
845 if ((flags
& BDRV_O_RDWR
) && !(flags
& BDRV_O_CHECK
)) {
846 error_setg(errp
, "parallels: Image was not closed correctly; "
847 "cannot be opened read/write");
853 opts
= qemu_opts_create(¶llels_runtime_opts
, NULL
, 0, errp
);
858 if (!qemu_opts_absorb_qdict(opts
, options
, errp
)) {
863 qemu_opt_get_size_del(opts
, PARALLELS_OPT_PREALLOC_SIZE
, 0);
864 s
->prealloc_size
= MAX(s
->tracks
, s
->prealloc_size
>> BDRV_SECTOR_BITS
);
865 buf
= qemu_opt_get_del(opts
, PARALLELS_OPT_PREALLOC_MODE
);
866 /* prealloc_mode can be downgraded later during allocate_clusters */
867 s
->prealloc_mode
= qapi_enum_parse(&prealloc_mode_lookup
, buf
,
868 PRL_PREALLOC_MODE_FALLOCATE
,
871 if (local_err
!= NULL
) {
872 error_propagate(errp
, local_err
);
877 if (flags
& BDRV_O_RDWR
) {
879 * It's unsafe to open image RW if there is an extension (as we
880 * don't support it). But parallels driver in QEMU historically
881 * ignores the extension, so print warning and don't care.
883 warn_report("Format Extension ignored in RW mode");
885 ret
= parallels_read_format_extension(
886 bs
, le64_to_cpu(ph
.ext_off
) << BDRV_SECTOR_BITS
, errp
);
893 if ((flags
& BDRV_O_RDWR
) && !(flags
& BDRV_O_INACTIVE
)) {
894 s
->header
->inuse
= cpu_to_le32(HEADER_INUSE_MAGIC
);
895 ret
= parallels_update_header(bs
);
901 s
->bat_dirty_block
= 4 * qemu_real_host_page_size();
903 bitmap_new(DIV_ROUND_UP(s
->header_size
, s
->bat_dirty_block
));
905 /* Disable migration until bdrv_activate method is added */
906 error_setg(&s
->migration_blocker
, "The Parallels format used by node '%s' "
907 "does not support live migration",
908 bdrv_get_device_or_node_name(bs
));
909 ret
= migrate_add_blocker(s
->migration_blocker
, errp
);
911 error_free(s
->migration_blocker
);
914 qemu_co_mutex_init(&s
->lock
);
918 error_setg(errp
, "Image not in Parallels format");
922 qemu_vfree(s
->header
);
927 static void parallels_close(BlockDriverState
*bs
)
929 BDRVParallelsState
*s
= bs
->opaque
;
931 if ((bs
->open_flags
& BDRV_O_RDWR
) && !(bs
->open_flags
& BDRV_O_INACTIVE
)) {
932 s
->header
->inuse
= 0;
933 parallels_update_header(bs
);
935 /* errors are ignored, so we might as well pass exact=true */
936 bdrv_truncate(bs
->file
, s
->data_end
<< BDRV_SECTOR_BITS
, true,
937 PREALLOC_MODE_OFF
, 0, NULL
);
940 g_free(s
->bat_dirty_bmap
);
941 qemu_vfree(s
->header
);
943 migrate_del_blocker(s
->migration_blocker
);
944 error_free(s
->migration_blocker
);
947 static BlockDriver bdrv_parallels
= {
948 .format_name
= "parallels",
949 .instance_size
= sizeof(BDRVParallelsState
),
950 .bdrv_probe
= parallels_probe
,
951 .bdrv_open
= parallels_open
,
952 .bdrv_close
= parallels_close
,
953 .bdrv_child_perm
= bdrv_default_perms
,
954 .bdrv_co_block_status
= parallels_co_block_status
,
955 .bdrv_has_zero_init
= bdrv_has_zero_init_1
,
956 .bdrv_co_flush_to_os
= parallels_co_flush_to_os
,
957 .bdrv_co_readv
= parallels_co_readv
,
958 .bdrv_co_writev
= parallels_co_writev
,
960 .supports_backing
= true,
961 .bdrv_co_create
= parallels_co_create
,
962 .bdrv_co_create_opts
= parallels_co_create_opts
,
963 .bdrv_co_check
= parallels_co_check
,
964 .create_opts
= ¶llels_create_opts
,
967 static void bdrv_parallels_init(void)
969 bdrv_register(&bdrv_parallels
);
972 block_init(bdrv_parallels_init
);