xfs: DIO writes within EOF don't need an ioend
DIO writes that lie entirely within EOF have nothing to do in IO completion. In this case, we don't need no steekin' ioend, and so we can avoid allocating an ioend until we have a mapping that spans EOF. This means that IO completion has two contexts - deferred completion to the dio workqueue that uses an ioend, and interrupt completion that does nothing because there is nothing that can be done in this context. Signed-off-by:Dave Chinner <dchinner@redhat.com> Reviewed-by:
Brian Foster <bfoster@redhat.com> Signed-off-by:
Dave Chinner <david@fromorbit.com>
parent
6dfa1b67
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