vfs/xfs: directio updates to ease COW handling V2

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See http://www.infradead.org/rpr.html

The first patch ensures ->end_io is always called for direct I/O requests
that pass it in, even if there was a zero length write, or if an error
occured.  The existing users have been updated to ignore it, but XFS
will make use of it in the future, and a comment in ext4 suggests it
might be useful for it as well.

The other two simplify the XFS direct I/O code.

Changes since V1:
 - allow ->end_io to return errors
 - a comment spelling fix


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