futher decouple DAX from block devices

[Darrick J. Wong]

On Thu, Nov 04, 2021 at 09:17:40AM +0100, Christoph Hellwig wrote:
> On Wed, Nov 03, 2021 at 12:59:31PM -0500, Eric Sandeen wrote:
> > Christoph, can I ask what the end game looks like, here? If dax is completely
> > decoupled from block devices, are there user-visible changes?
> 
> Yes.
> 
> > If I want to
> > run fs-dax on a pmem device - what do I point mkfs at, if not a block device?
> 
> The rough plan is to use the device dax character devices.  I'll hopefully
> have a draft version in the next days.

/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. ;)

--D