qcow2: skip writing zero buffers to empty COW areas

qcow2: skip writing zero buffers to empty COW areas

If COW areas of the newly allocated clusters are zeroes on the backing
image, efficient bdrv_write_zeroes(flags=BDRV_REQ_NO_FALLBACK) can be
used on the whole cluster instead of writing explicit zero buffers later
in perform_cow().

iotest 060:
write to the discarded cluster does not trigger COW anymore.
Use a backing image instead.

Signed-off-by: Anton Nefedov <[email protected]>
Message-id: 20190516142749[email protected]
Reviewed-by: Vladimir Sementsov-Ogievskiy <[email protected]>
Reviewed-by: Alberto Garcia <[email protected]>
Signed-off-by: Max Reitz <[email protected]>