Linus Torvalds [off-list ref] wrote:

But no, it's not a replacement for actual code review after the fact.

If you think email has too long latency for review, and can't use
public mailing lists and cc the people who are maintainers, then I
simply don't want your patches.

I think we were talking at cross-purposes by the term "development" here.  I
was referring to the discussion of how the implementation should be done and
working closely with colleagues - both inside and outside Red Hat - to get
things working, not specifically the public review side of things.  It's just
that I don't have a complete record of the how-to-implement-it, the
how-to-get-various-bits-working-together and the why-is-it-not-working?
discussions.

Anyway, I have posted my fscache modernisation patches multiple times for
public review, I have tried to involve the wider community in aspects of the
development on public mailing lists and I have been including the maintainers
in to/cc.

I've posted the more full patchset for public review a number of times:

4th May 2020:
https://lore.kernel.org/linux-fsdevel/158861203563.340223.7585359869938129395.stgit@warthog.procyon.org.uk/ (local)

13th Jul (split into three subsets):
https://lore.kernel.org/linux-fsdevel/159465766378.1376105.11619976251039287525.stgit@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-fsdevel/159465784033.1376674.18106463693989811037.stgit@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-fsdevel/159465821598.1377938.2046362270225008168.stgit@warthog.procyon.org.uk/ (local)

20th Nov:
https://lore.kernel.org/linux-fsdevel/160588455242.3465195.3214733858273019178.stgit@warthog.procyon.org.uk/ (local)

I then cut it down and posted that publically a couple of times:

20th Jan:
https://lore.kernel.org/linux-fsdevel/161118128472.1232039.11746799833066425131.stgit@warthog.procyon.org.uk/ (local)

25th Jan:
https://lore.kernel.org/linux-fsdevel/161161025063.2537118.2009249444682241405.stgit@warthog.procyon.org.uk/ (local)

I let you know what was coming here:
https://lore.kernel.org/linux-fsdevel/447452.1596109876@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-fsdevel/2522190.1612544534@warthog.procyon.org.uk/ (local)

to try and find out whether you were going to have any objections to the
design in advance, rather than at the last minute.

I've apprised people of what I was up to:
https://lore.kernel.org/lkml/24942.1573667720@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-fsdevel/2758811.1610621106@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-fsdevel/1441311.1598547738@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-fsdevel/160655.1611012999@warthog.procyon.org.uk/ (local)

Asked for consultation on parts of what I wanted to do:
https://lore.kernel.org/linux-fsdevel/3326.1579019665@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-fsdevel/4467.1579020509@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-fsdevel/3577430.1579705075@warthog.procyon.org.uk/ (local)

Asked someone who is actually using fscache in production to test the rewrite:
https://listman.redhat.com/archives/linux-cachefs/2020-December/msg00000.html

I've posted partial patches to try and help 9p and cifs along:
https://lore.kernel.org/linux-fsdevel/1514086.1605697347@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-cifs/1794123.1605713481@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-fsdevel/241017.1612263863@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-cifs/270998.1612265397@warthog.procyon.org.uk/ (local)

(Jeff has been handling Ceph and Dave NFS).

Proposed conference topics related to this:
https://lore.kernel.org/linux-fsdevel/9608.1575900019@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-fsdevel/14196.1575902815@warthog.procyon.org.uk/ (local)
https://lore.kernel.org/linux-fsdevel/364531.1579265357@warthog.procyon.org.uk/ (local)

though the lockdown put paid to that:-(

Willy has discussed it too:
https://lore.kernel.org/linux-fsdevel/20200826193116.GU17456@casper.infradead.org/ (local)

David