On Thu, Feb 15, 2018 at 10:58:54AM -0700, Dave Jiang wrote:

I think Darrick wanted to keep the API the same for non-XFS users. I'm
ok with dropping the passed in sb if Darrick has no objections.

But the old API is gone - everyone either uses the new
sb_dax_supported, or the updated bdev_dax_supported.