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From: Christoph Hellwig <hch@lst.de>
Subject: iomap fixes
Date: Wed, 28 Feb 2018 09:45:49 -0800
Message-Id: <20180228174552.31919-1-hch@lst.de>
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Cc: david@fromorbit.com

A few iomap fixes for 4.16-rc and -stable:

 - don't allocate blocks for zeroing holes or unwritten extents on files
   with the reflink bit set
 - don't take the exlusive ilock when no needed in iomap_begin
 - don't block on the ilock for RWF_NOWAIT