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Date:   Tue, 29 Aug 2017 14:31:27 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Jan Kara <jack@...e.cz>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] fs, xfs: perform dax_device lookup at mount

On Tue, Aug 29, 2017 at 2:26 PM, Christoph Hellwig <hch@....de> wrote:
> Call me nitpicky, but..
>
> First this really should be three patches, one for the DAX code, one
> for the VFS code and one for XFS.  The DAX and XFS bits looks fine to
> me:
>
> Reviewed-by: Christoph Hellwig <hch@....de>
>
> But I'm a little worried about stuffing more DAX knowledge into the
> block mount_bdev helper.  For now it's probably ok as everything
> else would involve a lot of refactoring and/or duplication, but
> I'm generally not too happy about it.

I think this is why we ended up with calling dax_get_by_host() in
->iomap_begin() because the mount_bdev() touches I started with back
when this was first introduced were not very palatable. I agree with
the direction to move to mount_dax() in the future. I can respin this
into three patches and a TODO comment about how we want to kill the
dax knowledge in mount_bdev() going forward.

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