Re: [PATCH 0/6] power_of_2 emulation support for NVMe ZNS devices

Luis Chamberlain
2022-03-15T17:01:10Z

On Tue, Mar 15, 2022 at 02:30:52PM +0100, Christoph Hellwig wrote:
> On Tue, Mar 15, 2022 at 02:26:11PM +0100, Javier González wrote:
> > but we do not see a usage for ZNS in F2FS, as it is a mobile
> > file-system. As other interfaces arrive, this work will become natural.
> >
> > ZoneFS and butrfs are good targets for ZNS and these we can do. I would
> > still do the work in phases to make sure we have enough early feedback
> > from the community.
> >
> > Since this thread has been very active, I will wait some time for
> > Christoph and others to catch up before we start sending code.
>
> Can someone summarize where we stand?

RFCs should be posted to help review and evaluate direct NPO2 support
(not emulation) given we have no vendor willing to take a position that
NPO2 will *never* be supported on ZNS, and its not clear yet how many
vendors other than Samsung actually require NPO2 support. The other
reason is existing NPO2 customers currently cake in hacks to Linux to
supoport NPO2 support, and so a fragmentation already exists. To help
address this it's best to evaluate what the world of NPO2 support would
look like and put the effort to do the work for that and review that.

Luis