qcow2: Implement .bdrv_co_pwritev()
This changes qcow2 to implement the byte-based .bdrv_co_pwritev interface rather than the sector-based old one. As preallocation uses the same allocation function as normal writes, and the interface of that function needs to be changed, it is converted in the same patch. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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