qcow2: Make perform_cow() call do_perform_cow() twice
Instead of calling perform_cow() twice with a different COW region each time, call it just once and make perform_cow() handle both regions. This patch simply moves code around. The next one will do the actual reordering of the COW operations. Signed-off-by: NAlberto Garcia <berto@igalia.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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