Re: [PATCH 03/19] fs: release anon dev_t in deactivate_locked_super

[Christian Brauner]

> > tree of any filesystem (in-tree one or not) will have to go through the
> > changes and figure out WTF to do with their existing code.  We are
> > going to play whack-a-mole for at least several years as development
> > branches get rebased and merged.
> 
> Let me write something up.

So here I've written two porting.rst patches that aim to reflect the
current state of things (They do _not_ reflect what's in Christoph's
series here as that'ss again pretty separate and will require additional
spelling out.).

I'm adding explanation for both the old and new logic fwiw. I hope to
upstream these docs soon so we all have something to point to.