block/qcow: use buffer-based io
Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NStefano Garzarella <sgarzare@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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