linux-ext4 - vfs/xfs: directio updates to ease COW handling V2

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Date:	Wed,  3 Feb 2016 19:40:13 +0100
From:	Christoph Hellwig <hch@....de>
To:	linux-fsdevel@...r.kernel.org, xfs@....sgi.com,
	linux-ext4@...r.kernel.org, ocfs2-devel@....oracle.com
Subject: vfs/xfs: directio updates to ease COW handling V2

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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