linux-ext4 - Re: futher decouple DAX from block devices

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Date:   Thu, 4 Nov 2021 18:35:59 +0100
From:   Christoph Hellwig <hch@....de>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     Christoph Hellwig <hch@....de>, Eric Sandeen <sandeen@...deen.net>,
        Dan Williams <dan.j.williams@...el.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Ira Weiny <ira.weiny@...el.com>, dm-devel@...hat.com,
        linux-xfs@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-s390@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: futher decouple DAX from block devices

On Thu, Nov 04, 2021 at 10:34:17AM -0700, Darrick J. Wong wrote:
> /me wonders, are block devices going away?  Will mkfs.xfs have to learn
> how to talk to certain chardevs?  I guess jffs2 and others already do
> that kind of thing... but I suppose I can wait for the real draft to
> show up to ramble further. ;)

Right now I've mostly been looking into the kernel side.  An no, I
do not expect /dev/pmem* to go away as you'll still need it for a
not DAX aware file system and/or application (such as mkfs initially).

But yes, just pointing mkfs to the chardev should be doable with very
little work.  We can point it to a regular file after all.