direct-io: add flag to allow aio writes beyond i_size
Some filesystems can handle direct I/O writes beyond i_size safely, so allow them to opt into receiving them. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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