2 * Block driver for the VMDK format
4 * Copyright (c) 2004 Fabrice Bellard
5 * Copyright (c) 2005 Filip Navara
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 #include "qemu-common.h"
27 #include "block_int.h"
29 #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D')
30 #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V')
35 uint32_t disk_sectors
;
37 uint32_t l1dir_offset
;
39 uint32_t file_sectors
;
42 uint32_t sectors_per_track
;
52 int32_t num_gtes_per_gte
;
58 } __attribute__((packed
)) VMDK4Header
;
60 #define L2_CACHE_SIZE 16
62 typedef struct BDRVVmdkState
{
64 int64_t l1_table_offset
;
65 int64_t l1_backup_table_offset
;
67 uint32_t *l1_backup_table
;
69 uint32_t l1_entry_sectors
;
73 uint32_t l2_cache_offsets
[L2_CACHE_SIZE
];
74 uint32_t l2_cache_counts
[L2_CACHE_SIZE
];
76 unsigned int cluster_sectors
;
81 typedef struct VmdkMetaData
{
83 unsigned int l1_index
;
84 unsigned int l2_index
;
85 unsigned int l2_offset
;
89 typedef struct ActiveBDRVState
{
90 BlockDriverState
*hd
; // active image handler
91 uint64_t cluster_offset
; // current write offset
94 static ActiveBDRVState activeBDRV
;
97 static int vmdk_probe(const uint8_t *buf
, int buf_size
, const char *filename
)
103 magic
= be32_to_cpu(*(uint32_t *)buf
);
104 if (magic
== VMDK3_MAGIC
||
105 magic
== VMDK4_MAGIC
)
113 #define SECTOR_SIZE 512
114 #define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each
115 #define HEADER_SIZE 512 // first sector of 512 bytes
117 static uint32_t vmdk_read_cid(BlockDriverState
*bs
, int parent
)
119 BDRVVmdkState
*s
= bs
->opaque
;
120 char desc
[DESC_SIZE
];
122 const char *p_name
, *cid_str
;
125 /* the descriptor offset = 0x200 */
126 if (bdrv_pread(s
->hd
, 0x200, desc
, DESC_SIZE
) != DESC_SIZE
)
130 cid_str
= "parentCID";
131 cid_str_size
= sizeof("parentCID");
134 cid_str_size
= sizeof("CID");
137 if ((p_name
= strstr(desc
,cid_str
)) != 0) {
138 p_name
+= cid_str_size
;
139 sscanf(p_name
,"%x",&cid
);
145 static int vmdk_write_cid(BlockDriverState
*bs
, uint32_t cid
)
147 BDRVVmdkState
*s
= bs
->opaque
;
148 char desc
[DESC_SIZE
], tmp_desc
[DESC_SIZE
];
149 char *p_name
, *tmp_str
;
151 /* the descriptor offset = 0x200 */
152 if (bdrv_pread(s
->hd
, 0x200, desc
, DESC_SIZE
) != DESC_SIZE
)
155 tmp_str
= strstr(desc
,"parentCID");
156 pstrcpy(tmp_desc
, sizeof(tmp_desc
), tmp_str
);
157 if ((p_name
= strstr(desc
,"CID")) != 0) {
158 p_name
+= sizeof("CID");
159 snprintf(p_name
, sizeof(desc
) - (p_name
- desc
), "%x\n", cid
);
160 pstrcat(desc
, sizeof(desc
), tmp_desc
);
163 if (bdrv_pwrite(s
->hd
, 0x200, desc
, DESC_SIZE
) != DESC_SIZE
)
168 static int vmdk_is_cid_valid(BlockDriverState
*bs
)
171 BDRVVmdkState
*s
= bs
->opaque
;
172 BlockDriverState
*p_bs
= s
->hd
->backing_hd
;
176 cur_pcid
= vmdk_read_cid(p_bs
,0);
177 if (s
->parent_cid
!= cur_pcid
)
186 static int vmdk_snapshot_create(const char *filename
, const char *backing_file
)
190 char *p_name
, *gd_buf
, *rgd_buf
;
191 const char *real_filename
, *temp_str
;
193 uint32_t gde_entries
, gd_size
;
194 int64_t gd_offset
, rgd_offset
, capacity
, gt_size
;
195 char p_desc
[DESC_SIZE
], s_desc
[DESC_SIZE
], hdr
[HEADER_SIZE
];
196 static const char desc_template
[] =
197 "# Disk DescriptorFile\n"
201 "createType=\"monolithicSparse\"\n"
202 "parentFileNameHint=\"%s\"\n"
204 "# Extent description\n"
205 "RW %u SPARSE \"%s\"\n"
207 "# The Disk Data Base \n"
211 snp_fd
= open(filename
, O_RDWR
| O_CREAT
| O_TRUNC
| O_BINARY
| O_LARGEFILE
, 0644);
214 p_fd
= open(backing_file
, O_RDONLY
| O_BINARY
| O_LARGEFILE
);
220 /* read the header */
221 if (lseek(p_fd
, 0x0, SEEK_SET
) == -1)
223 if (read(p_fd
, hdr
, HEADER_SIZE
) != HEADER_SIZE
)
226 /* write the header */
227 if (lseek(snp_fd
, 0x0, SEEK_SET
) == -1)
229 if (write(snp_fd
, hdr
, HEADER_SIZE
) == -1)
232 memset(&header
, 0, sizeof(header
));
233 memcpy(&header
,&hdr
[4], sizeof(header
)); // skip the VMDK4_MAGIC
235 ftruncate(snp_fd
, header
.grain_offset
<< 9);
236 /* the descriptor offset = 0x200 */
237 if (lseek(p_fd
, 0x200, SEEK_SET
) == -1)
239 if (read(p_fd
, p_desc
, DESC_SIZE
) != DESC_SIZE
)
242 if ((p_name
= strstr(p_desc
,"CID")) != 0) {
243 p_name
+= sizeof("CID");
244 sscanf(p_name
,"%x",&p_cid
);
247 real_filename
= filename
;
248 if ((temp_str
= strrchr(real_filename
, '\\')) != NULL
)
249 real_filename
= temp_str
+ 1;
250 if ((temp_str
= strrchr(real_filename
, '/')) != NULL
)
251 real_filename
= temp_str
+ 1;
252 if ((temp_str
= strrchr(real_filename
, ':')) != NULL
)
253 real_filename
= temp_str
+ 1;
255 snprintf(s_desc
, sizeof(s_desc
), desc_template
, p_cid
, p_cid
, backing_file
,
256 (uint32_t)header
.capacity
, real_filename
);
258 /* write the descriptor */
259 if (lseek(snp_fd
, 0x200, SEEK_SET
) == -1)
261 if (write(snp_fd
, s_desc
, strlen(s_desc
)) == -1)
264 gd_offset
= header
.gd_offset
* SECTOR_SIZE
; // offset of GD table
265 rgd_offset
= header
.rgd_offset
* SECTOR_SIZE
; // offset of RGD table
266 capacity
= header
.capacity
* SECTOR_SIZE
; // Extent size
268 * Each GDE span 32M disk, means:
269 * 512 GTE per GT, each GTE points to grain
271 gt_size
= (int64_t)header
.num_gtes_per_gte
* header
.granularity
* SECTOR_SIZE
;
274 gde_entries
= (uint32_t)(capacity
/ gt_size
); // number of gde/rgde
275 gd_size
= gde_entries
* sizeof(uint32_t);
278 rgd_buf
= qemu_malloc(gd_size
);
281 if (lseek(p_fd
, rgd_offset
, SEEK_SET
) == -1)
283 if (read(p_fd
, rgd_buf
, gd_size
) != gd_size
)
285 if (lseek(snp_fd
, rgd_offset
, SEEK_SET
) == -1)
287 if (write(snp_fd
, rgd_buf
, gd_size
) == -1)
292 gd_buf
= qemu_malloc(gd_size
);
295 if (lseek(p_fd
, gd_offset
, SEEK_SET
) == -1)
297 if (read(p_fd
, gd_buf
, gd_size
) != gd_size
)
299 if (lseek(snp_fd
, gd_offset
, SEEK_SET
) == -1)
301 if (write(snp_fd
, gd_buf
, gd_size
) == -1)
319 static void vmdk_parent_close(BlockDriverState
*bs
)
322 bdrv_close(bs
->backing_hd
);
325 static int parent_open
= 0;
326 static int vmdk_parent_open(BlockDriverState
*bs
, const char * filename
)
328 BDRVVmdkState
*s
= bs
->opaque
;
330 char desc
[DESC_SIZE
];
331 char parent_img_name
[1024];
333 /* the descriptor offset = 0x200 */
334 if (bdrv_pread(s
->hd
, 0x200, desc
, DESC_SIZE
) != DESC_SIZE
)
337 if ((p_name
= strstr(desc
,"parentFileNameHint")) != 0) {
339 struct stat file_buf
;
341 p_name
+= sizeof("parentFileNameHint") + 1;
342 if ((end_name
= strchr(p_name
,'\"')) == 0)
344 if ((end_name
- p_name
) > sizeof (s
->hd
->backing_file
) - 1)
347 pstrcpy(s
->hd
->backing_file
, end_name
- p_name
+ 1, p_name
);
348 if (stat(s
->hd
->backing_file
, &file_buf
) != 0) {
349 path_combine(parent_img_name
, sizeof(parent_img_name
),
350 filename
, s
->hd
->backing_file
);
352 pstrcpy(parent_img_name
, sizeof(parent_img_name
),
353 s
->hd
->backing_file
);
356 s
->hd
->backing_hd
= bdrv_new("");
357 if (!s
->hd
->backing_hd
) {
363 if (bdrv_open(s
->hd
->backing_hd
, parent_img_name
, BDRV_O_RDONLY
) < 0)
371 static int vmdk_open(BlockDriverState
*bs
, const char *filename
, int flags
)
373 BDRVVmdkState
*s
= bs
->opaque
;
378 // Parent must be opened as RO.
379 flags
= BDRV_O_RDONLY
;
381 ret
= bdrv_file_open(&s
->hd
, filename
, flags
);
384 if (bdrv_pread(s
->hd
, 0, &magic
, sizeof(magic
)) != sizeof(magic
))
387 magic
= be32_to_cpu(magic
);
388 if (magic
== VMDK3_MAGIC
) {
391 if (bdrv_pread(s
->hd
, sizeof(magic
), &header
, sizeof(header
)) != sizeof(header
))
393 s
->cluster_sectors
= le32_to_cpu(header
.granularity
);
396 bs
->total_sectors
= le32_to_cpu(header
.disk_sectors
);
397 s
->l1_table_offset
= le32_to_cpu(header
.l1dir_offset
) << 9;
398 s
->l1_backup_table_offset
= 0;
399 s
->l1_entry_sectors
= s
->l2_size
* s
->cluster_sectors
;
400 } else if (magic
== VMDK4_MAGIC
) {
403 if (bdrv_pread(s
->hd
, sizeof(magic
), &header
, sizeof(header
)) != sizeof(header
))
405 bs
->total_sectors
= le64_to_cpu(header
.capacity
);
406 s
->cluster_sectors
= le64_to_cpu(header
.granularity
);
407 s
->l2_size
= le32_to_cpu(header
.num_gtes_per_gte
);
408 s
->l1_entry_sectors
= s
->l2_size
* s
->cluster_sectors
;
409 if (s
->l1_entry_sectors
<= 0)
411 s
->l1_size
= (bs
->total_sectors
+ s
->l1_entry_sectors
- 1)
412 / s
->l1_entry_sectors
;
413 s
->l1_table_offset
= le64_to_cpu(header
.rgd_offset
) << 9;
414 s
->l1_backup_table_offset
= le64_to_cpu(header
.gd_offset
) << 9;
421 // try to open parent images, if exist
422 if (vmdk_parent_open(bs
, filename
) != 0)
424 // write the CID once after the image creation
425 s
->parent_cid
= vmdk_read_cid(bs
,1);
430 /* read the L1 table */
431 l1_size
= s
->l1_size
* sizeof(uint32_t);
432 s
->l1_table
= qemu_malloc(l1_size
);
435 if (bdrv_pread(s
->hd
, s
->l1_table_offset
, s
->l1_table
, l1_size
) != l1_size
)
437 for(i
= 0; i
< s
->l1_size
; i
++) {
438 le32_to_cpus(&s
->l1_table
[i
]);
441 if (s
->l1_backup_table_offset
) {
442 s
->l1_backup_table
= qemu_malloc(l1_size
);
443 if (!s
->l1_backup_table
)
445 if (bdrv_pread(s
->hd
, s
->l1_backup_table_offset
, s
->l1_backup_table
, l1_size
) != l1_size
)
447 for(i
= 0; i
< s
->l1_size
; i
++) {
448 le32_to_cpus(&s
->l1_backup_table
[i
]);
452 s
->l2_cache
= qemu_malloc(s
->l2_size
* L2_CACHE_SIZE
* sizeof(uint32_t));
457 qemu_free(s
->l1_backup_table
);
458 qemu_free(s
->l1_table
);
459 qemu_free(s
->l2_cache
);
464 static uint64_t get_cluster_offset(BlockDriverState
*bs
, VmdkMetaData
*m_data
,
465 uint64_t offset
, int allocate
);
467 static int get_whole_cluster(BlockDriverState
*bs
, uint64_t cluster_offset
,
468 uint64_t offset
, int allocate
)
470 uint64_t parent_cluster_offset
;
471 BDRVVmdkState
*s
= bs
->opaque
;
472 uint8_t whole_grain
[s
->cluster_sectors
*512]; // 128 sectors * 512 bytes each = grain size 64KB
474 // we will be here if it's first write on non-exist grain(cluster).
475 // try to read from parent image, if exist
476 if (s
->hd
->backing_hd
) {
477 BDRVVmdkState
*ps
= s
->hd
->backing_hd
->opaque
;
479 if (!vmdk_is_cid_valid(bs
))
482 parent_cluster_offset
= get_cluster_offset(s
->hd
->backing_hd
, NULL
, offset
, allocate
);
484 if (parent_cluster_offset
) {
485 BDRVVmdkState
*act_s
= activeBDRV
.hd
->opaque
;
487 if (bdrv_pread(ps
->hd
, parent_cluster_offset
, whole_grain
, ps
->cluster_sectors
*512) != ps
->cluster_sectors
*512)
490 //Write grain only into the active image
491 if (bdrv_pwrite(act_s
->hd
, activeBDRV
.cluster_offset
<< 9, whole_grain
, sizeof(whole_grain
)) != sizeof(whole_grain
))
498 static int vmdk_L2update(BlockDriverState
*bs
, VmdkMetaData
*m_data
)
500 BDRVVmdkState
*s
= bs
->opaque
;
502 /* update L2 table */
503 if (bdrv_pwrite(s
->hd
, ((int64_t)m_data
->l2_offset
* 512) + (m_data
->l2_index
* sizeof(m_data
->offset
)),
504 &(m_data
->offset
), sizeof(m_data
->offset
)) != sizeof(m_data
->offset
))
506 /* update backup L2 table */
507 if (s
->l1_backup_table_offset
!= 0) {
508 m_data
->l2_offset
= s
->l1_backup_table
[m_data
->l1_index
];
509 if (bdrv_pwrite(s
->hd
, ((int64_t)m_data
->l2_offset
* 512) + (m_data
->l2_index
* sizeof(m_data
->offset
)),
510 &(m_data
->offset
), sizeof(m_data
->offset
)) != sizeof(m_data
->offset
))
517 static uint64_t get_cluster_offset(BlockDriverState
*bs
, VmdkMetaData
*m_data
,
518 uint64_t offset
, int allocate
)
520 BDRVVmdkState
*s
= bs
->opaque
;
521 unsigned int l1_index
, l2_offset
, l2_index
;
523 uint32_t min_count
, *l2_table
, tmp
= 0;
524 uint64_t cluster_offset
;
529 l1_index
= (offset
>> 9) / s
->l1_entry_sectors
;
530 if (l1_index
>= s
->l1_size
)
532 l2_offset
= s
->l1_table
[l1_index
];
535 for(i
= 0; i
< L2_CACHE_SIZE
; i
++) {
536 if (l2_offset
== s
->l2_cache_offsets
[i
]) {
537 /* increment the hit count */
538 if (++s
->l2_cache_counts
[i
] == 0xffffffff) {
539 for(j
= 0; j
< L2_CACHE_SIZE
; j
++) {
540 s
->l2_cache_counts
[j
] >>= 1;
543 l2_table
= s
->l2_cache
+ (i
* s
->l2_size
);
547 /* not found: load a new entry in the least used one */
549 min_count
= 0xffffffff;
550 for(i
= 0; i
< L2_CACHE_SIZE
; i
++) {
551 if (s
->l2_cache_counts
[i
] < min_count
) {
552 min_count
= s
->l2_cache_counts
[i
];
556 l2_table
= s
->l2_cache
+ (min_index
* s
->l2_size
);
557 if (bdrv_pread(s
->hd
, (int64_t)l2_offset
* 512, l2_table
, s
->l2_size
* sizeof(uint32_t)) !=
558 s
->l2_size
* sizeof(uint32_t))
561 s
->l2_cache_offsets
[min_index
] = l2_offset
;
562 s
->l2_cache_counts
[min_index
] = 1;
564 l2_index
= ((offset
>> 9) / s
->cluster_sectors
) % s
->l2_size
;
565 cluster_offset
= le32_to_cpu(l2_table
[l2_index
]);
567 if (!cluster_offset
) {
570 // Avoid the L2 tables update for the images that have snapshots.
572 cluster_offset
= bdrv_getlength(s
->hd
);
573 bdrv_truncate(s
->hd
, cluster_offset
+ (s
->cluster_sectors
<< 9));
575 cluster_offset
>>= 9;
576 tmp
= cpu_to_le32(cluster_offset
);
577 l2_table
[l2_index
] = tmp
;
578 // Save the active image state
579 activeBDRV
.cluster_offset
= cluster_offset
;
582 /* First of all we write grain itself, to avoid race condition
583 * that may to corrupt the image.
584 * This problem may occur because of insufficient space on host disk
585 * or inappropriate VM shutdown.
587 if (get_whole_cluster(bs
, cluster_offset
, offset
, allocate
) == -1)
591 m_data
->offset
= tmp
;
592 m_data
->l1_index
= l1_index
;
593 m_data
->l2_index
= l2_index
;
594 m_data
->l2_offset
= l2_offset
;
598 cluster_offset
<<= 9;
599 return cluster_offset
;
602 static int vmdk_is_allocated(BlockDriverState
*bs
, int64_t sector_num
,
603 int nb_sectors
, int *pnum
)
605 BDRVVmdkState
*s
= bs
->opaque
;
606 int index_in_cluster
, n
;
607 uint64_t cluster_offset
;
609 cluster_offset
= get_cluster_offset(bs
, NULL
, sector_num
<< 9, 0);
610 index_in_cluster
= sector_num
% s
->cluster_sectors
;
611 n
= s
->cluster_sectors
- index_in_cluster
;
615 return (cluster_offset
!= 0);
618 static int vmdk_read(BlockDriverState
*bs
, int64_t sector_num
,
619 uint8_t *buf
, int nb_sectors
)
621 BDRVVmdkState
*s
= bs
->opaque
;
622 int index_in_cluster
, n
, ret
;
623 uint64_t cluster_offset
;
625 while (nb_sectors
> 0) {
626 cluster_offset
= get_cluster_offset(bs
, NULL
, sector_num
<< 9, 0);
627 index_in_cluster
= sector_num
% s
->cluster_sectors
;
628 n
= s
->cluster_sectors
- index_in_cluster
;
631 if (!cluster_offset
) {
632 // try to read from parent image, if exist
633 if (s
->hd
->backing_hd
) {
634 if (!vmdk_is_cid_valid(bs
))
636 ret
= bdrv_read(s
->hd
->backing_hd
, sector_num
, buf
, n
);
640 memset(buf
, 0, 512 * n
);
643 if(bdrv_pread(s
->hd
, cluster_offset
+ index_in_cluster
* 512, buf
, n
* 512) != n
* 512)
653 static int vmdk_write(BlockDriverState
*bs
, int64_t sector_num
,
654 const uint8_t *buf
, int nb_sectors
)
656 BDRVVmdkState
*s
= bs
->opaque
;
658 int index_in_cluster
, n
;
659 uint64_t cluster_offset
;
660 static int cid_update
= 0;
662 if (sector_num
> bs
->total_sectors
) {
664 "(VMDK) Wrong offset: sector_num=0x%" PRIx64
665 " total_sectors=0x%" PRIx64
"\n",
666 sector_num
, bs
->total_sectors
);
670 while (nb_sectors
> 0) {
671 index_in_cluster
= sector_num
& (s
->cluster_sectors
- 1);
672 n
= s
->cluster_sectors
- index_in_cluster
;
675 cluster_offset
= get_cluster_offset(bs
, &m_data
, sector_num
<< 9, 1);
679 if (bdrv_pwrite(s
->hd
, cluster_offset
+ index_in_cluster
* 512, buf
, n
* 512) != n
* 512)
682 /* update L2 tables */
683 if (vmdk_L2update(bs
, &m_data
) == -1)
690 // update CID on the first write every time the virtual disk is opened
692 vmdk_write_cid(bs
, time(NULL
));
699 static int vmdk_create(const char *filename
, int64_t total_size
,
700 const char *backing_file
, int flags
)
704 uint32_t tmp
, magic
, grains
, gd_size
, gt_size
, gt_count
;
705 static const char desc_template
[] =
706 "# Disk DescriptorFile\n"
709 "parentCID=ffffffff\n"
710 "createType=\"monolithicSparse\"\n"
712 "# Extent description\n"
713 "RW %" PRId64
" SPARSE \"%s\"\n"
715 "# The Disk Data Base \n"
718 "ddb.virtualHWVersion = \"%d\"\n"
719 "ddb.geometry.cylinders = \"%" PRId64
"\"\n"
720 "ddb.geometry.heads = \"16\"\n"
721 "ddb.geometry.sectors = \"63\"\n"
722 "ddb.adapterType = \"ide\"\n";
724 const char *real_filename
, *temp_str
;
726 /* XXX: add support for backing file */
728 return vmdk_snapshot_create(filename
, backing_file
);
731 fd
= open(filename
, O_WRONLY
| O_CREAT
| O_TRUNC
| O_BINARY
| O_LARGEFILE
,
735 magic
= cpu_to_be32(VMDK4_MAGIC
);
736 memset(&header
, 0, sizeof(header
));
737 header
.version
= cpu_to_le32(1);
738 header
.flags
= cpu_to_le32(3); /* ?? */
739 header
.capacity
= cpu_to_le64(total_size
);
740 header
.granularity
= cpu_to_le64(128);
741 header
.num_gtes_per_gte
= cpu_to_le32(512);
743 grains
= (total_size
+ header
.granularity
- 1) / header
.granularity
;
744 gt_size
= ((header
.num_gtes_per_gte
* sizeof(uint32_t)) + 511) >> 9;
745 gt_count
= (grains
+ header
.num_gtes_per_gte
- 1) / header
.num_gtes_per_gte
;
746 gd_size
= (gt_count
* sizeof(uint32_t) + 511) >> 9;
748 header
.desc_offset
= 1;
749 header
.desc_size
= 20;
750 header
.rgd_offset
= header
.desc_offset
+ header
.desc_size
;
751 header
.gd_offset
= header
.rgd_offset
+ gd_size
+ (gt_size
* gt_count
);
752 header
.grain_offset
=
753 ((header
.gd_offset
+ gd_size
+ (gt_size
* gt_count
) +
754 header
.granularity
- 1) / header
.granularity
) *
757 header
.desc_offset
= cpu_to_le64(header
.desc_offset
);
758 header
.desc_size
= cpu_to_le64(header
.desc_size
);
759 header
.rgd_offset
= cpu_to_le64(header
.rgd_offset
);
760 header
.gd_offset
= cpu_to_le64(header
.gd_offset
);
761 header
.grain_offset
= cpu_to_le64(header
.grain_offset
);
763 header
.check_bytes
[0] = 0xa;
764 header
.check_bytes
[1] = 0x20;
765 header
.check_bytes
[2] = 0xd;
766 header
.check_bytes
[3] = 0xa;
768 /* write all the data */
769 write(fd
, &magic
, sizeof(magic
));
770 write(fd
, &header
, sizeof(header
));
772 ftruncate(fd
, header
.grain_offset
<< 9);
774 /* write grain directory */
775 lseek(fd
, le64_to_cpu(header
.rgd_offset
) << 9, SEEK_SET
);
776 for (i
= 0, tmp
= header
.rgd_offset
+ gd_size
;
777 i
< gt_count
; i
++, tmp
+= gt_size
)
778 write(fd
, &tmp
, sizeof(tmp
));
780 /* write backup grain directory */
781 lseek(fd
, le64_to_cpu(header
.gd_offset
) << 9, SEEK_SET
);
782 for (i
= 0, tmp
= header
.gd_offset
+ gd_size
;
783 i
< gt_count
; i
++, tmp
+= gt_size
)
784 write(fd
, &tmp
, sizeof(tmp
));
786 /* compose the descriptor */
787 real_filename
= filename
;
788 if ((temp_str
= strrchr(real_filename
, '\\')) != NULL
)
789 real_filename
= temp_str
+ 1;
790 if ((temp_str
= strrchr(real_filename
, '/')) != NULL
)
791 real_filename
= temp_str
+ 1;
792 if ((temp_str
= strrchr(real_filename
, ':')) != NULL
)
793 real_filename
= temp_str
+ 1;
794 snprintf(desc
, sizeof(desc
), desc_template
, (unsigned int)time(NULL
),
795 total_size
, real_filename
,
796 (flags
& BLOCK_FLAG_COMPAT6
? 6 : 4),
797 total_size
/ (int64_t)(63 * 16));
799 /* write the descriptor */
800 lseek(fd
, le64_to_cpu(header
.desc_offset
) << 9, SEEK_SET
);
801 write(fd
, desc
, strlen(desc
));
807 static void vmdk_close(BlockDriverState
*bs
)
809 BDRVVmdkState
*s
= bs
->opaque
;
811 qemu_free(s
->l1_table
);
812 qemu_free(s
->l2_cache
);
813 // try to close parent image, if exist
814 vmdk_parent_close(s
->hd
);
818 static void vmdk_flush(BlockDriverState
*bs
)
820 BDRVVmdkState
*s
= bs
->opaque
;
824 BlockDriver bdrv_vmdk
= {
826 sizeof(BDRVVmdkState
),