Re: [LSF/MM/BPF TOPIC] bcachefs

["Darrick J. Wong" <djwong@kernel.org>]

On Wed, Feb 22, 2023 at 02:46:31PM -0500, Kent Overstreet wrote:
> Hi, I'd like to give an update on bcachefs progress and talk about
> upstreaming.
> 
> There's been a lot of activity over the past year or so:
>  - allocator rewrite
>  - cycle detector for deadlock avoidance

XFS has rather a lot of locks and no ability to unwind a transaction
that has already dirtied incore state.  I bet you and I could have some
very interesting discussions about how to implement robust tx undo in a
filesystem.

(Not sure the /rest/ of the lsf crowd are going to care, but I do.)

>  - backpointers
>  - test infrastructure!

<cough> "test dashboard that we can all share" ?

>  - starting to integrate rust code (!)

I'm curious to hear about this topic, because I look at rust, and I look
at supercomplex filesystem code and wonder how in the world we're ever
going to port a (VERY SIMPLE) filesystem to Rust.  Now that I'm nearly
done with online repair for XFS, there's a lot of stupid crap about C
that I would like to start worrying about less because some other
language added enough guard rails to avoid the stupid.

>  - lots more bug squashing, scalability work, debug tooling improvements
> 
> I'd like to talk more about where things are at, long term goals, and
> finally upstreaming this beast.

Go for it, I say.

--D