Revision bf81507d
| b/block/vmdk.c | ||
|---|---|---|
| 842 | 842 |
uint64_t offset, |
| 843 | 843 |
bool allocate) |
| 844 | 844 |
{
|
| 845 |
/* 128 sectors * 512 bytes each = grain size 64KB */
|
|
| 846 |
uint8_t whole_grain[extent->cluster_sectors * 512];
|
|
| 845 |
int ret = VMDK_OK;
|
|
| 846 |
uint8_t *whole_grain = NULL;
|
|
| 847 | 847 |
|
| 848 | 848 |
/* we will be here if it's first write on non-exist grain(cluster). |
| 849 | 849 |
* try to read from parent image, if exist */ |
| 850 | 850 |
if (bs->backing_hd) {
|
| 851 |
int ret;
|
|
| 852 |
|
|
| 851 |
whole_grain =
|
|
| 852 |
qemu_blockalign(bs, extent->cluster_sectors << BDRV_SECTOR_BITS); |
|
| 853 | 853 |
if (!vmdk_is_cid_valid(bs)) {
|
| 854 |
return VMDK_ERROR; |
|
| 854 |
ret = VMDK_ERROR; |
|
| 855 |
goto exit; |
|
| 855 | 856 |
} |
| 856 | 857 |
|
| 857 | 858 |
/* floor offset to cluster */ |
| ... | ... | |
| 859 | 860 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain, |
| 860 | 861 |
extent->cluster_sectors); |
| 861 | 862 |
if (ret < 0) {
|
| 862 |
return VMDK_ERROR; |
|
| 863 |
ret = VMDK_ERROR; |
|
| 864 |
goto exit; |
|
| 863 | 865 |
} |
| 864 | 866 |
|
| 865 | 867 |
/* Write grain only into the active image */ |
| 866 | 868 |
ret = bdrv_write(extent->file, cluster_offset, whole_grain, |
| 867 | 869 |
extent->cluster_sectors); |
| 868 | 870 |
if (ret < 0) {
|
| 869 |
return VMDK_ERROR; |
|
| 871 |
ret = VMDK_ERROR; |
|
| 872 |
goto exit; |
|
| 870 | 873 |
} |
| 871 | 874 |
} |
| 872 |
return VMDK_OK; |
|
| 875 |
exit: |
|
| 876 |
qemu_vfree(whole_grain); |
|
| 877 |
return ret; |
|
| 873 | 878 |
} |
| 874 | 879 |
|
| 875 | 880 |
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) |
Also available in: Unified diff