futher decouple DAX from block devices

[Christoph Hellwig]

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.