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Date: Mon, 30 Jan 2017 13:26:58 +0100
From: Christoph Hellwig <hch@lst.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-nvdimm@lists.01.org, snitzer@redhat.com, toshi.kani@hpe.com,
        mawilcox@microsoft.com, linux-block@vger.kernel.org,
        jmoyer@redhat.com, linux-fsdevel@vger.kernel.org,
        ross.zwisler@linux.intel.com, hch@lst.de
Subject: Re: [RFC PATCH 13/17] fs: update mount_bdev() to lookup dax
        infrastructure
Message-ID: <20170130122658.GB9043@lst.de>
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On Sat, Jan 28, 2017 at 12:37:14AM -0800, Dan Williams wrote:
> This is in preparation for removing the ->direct_access() method from
> block_device_operations.

I don't think mount_bdev has any business knowing about DAX. 
Just call dax_get_by_host manually from the affected file systems for
now, and in the future we can have a pure-DAX mount_dax helper.