xfs: factor out a xfs_buftarg_is_dax helper
Refactor the DAX setup code in preparation of removing bdev_dax_supported. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Link: https://lore.kernel.org/r/20210826135510.6293-9-hch@lst.de Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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