From: Christoph Hellwig <hch@lst.de>
Subject: VFS/XFS: directio updates to ease COW handling
Date: Tue,  2 Feb 2016 21:17:34 +0100
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Cc: darrick.wong@oracle.com
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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.

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