From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Subject: Re: [PATCH v2 1/2] fs, xfs: perform dax_device lookup at mount
Date: Tue, 29 Aug 2017 23:36:35 +0200
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Cc: Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>, "Darrick J. Wong" <darrick.wong-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
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To: Dan Williams <dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
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On Tue, Aug 29, 2017 at 02:35:27PM -0700, Dan Williams wrote:
> Actually, why not just do this directly in xfs_fs_mount()? I think I
> can refactor this to not touch mount_bdev() and put all the details in
> the per-fs mount/umount paths.

Yes, and just cache in in the fs specific superblock.