linux-kernel - Re: [PATCH 01/19] dax: remove block device dependencies

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Date:   Tue, 7 Jan 2020 15:38:54 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     Vivek Goyal <vgoyal@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dave Chinner <david@...morbit.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        virtio-fs@...hat.com, Stefan Hajnoczi <stefanha@...hat.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 01/19] dax: remove block device dependencies

On Tue, Jan 7, 2020 at 11:46 AM Dan Williams <dan.j.williams@...el.com> wrote:
[..]
> > I'd say deprecate the
> > kernel automounting partitions, but I guess it already does that, and
>
> Ok, now I don't know why automounting is leaking into this discussion?
>
> > removing it would break /something/.
>
> Yes, the breakage risk is anyone that was using ext4 mount failure as
> a dax capability detector.
>
> > I guess you could put
> > "/dev/pmemXpY" on the deprecation schedule.
>
> ...but why deprecate /dev/pmemXpY partitions altogether? If someone
> doesn't care about dax then they can do all the legacy block things.
> If they do care about dax then work with whole device namespaces.

Circling back on this point now that I understand what you meant by
automount. It would need to be a full deprecation of /dev/pmemXpY
devices if kpartx dax support is going to fully take over for people
that want to use disk partition tables instead of EFI Namespace Labels
to carve up pmem.