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iomap based DAX path

From:  Christoph Hellwig <hch-AT-lst.de>
To:  linux-xfs-AT-vger.kernel.org, linux-fsdevel-AT-vger.kernel.org, linux-nvdimm-AT-ml01.01.org
Subject:  iomap based DAX path
Date:  Fri, 9 Sep 2016 18:34:34 +0200
Message-ID:  <1473438884-674-1-git-send-email-hch@lst.de>

This series adds a DAX I/O path based on the iomap interface.  This
allows more efficient block mapping including defined hole semantics,
and is an important step toward getting rid of buffer_heads in XFS.

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