block: Set BDRV_REQ_WRITE_UNCHANGED for COR writes
Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com> Message-id: 20180421132929.21610-5-mreitz@redhat.com Reviewed-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com>
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