[LSF/MM/BFP TOPIC] Composefs vs erofs+overlay

[Alexander Larsson <alexl@redhat.com>]

Hello,

Recently Giuseppe Scrivano and I have worked on[1] and proposed[2] the
Composefs filesystem. It is an opportunistically sharing, validating
image-based filesystem, targeting usecases like validated ostree
rootfs:es, validated container images that share common files, as well
as other image based usecases.

During the discussions in the composefs proposal (as seen on LWN[3])
is has been proposed that (with some changes to overlayfs), similar
behaviour can be achieved by combining the overlayfs
"overlay.redirect" xattr with an read-only filesystem such as erofs.

There are pros and cons to both these approaches, and the discussion
about their respective value has sometimes been heated. We would like
to have an in-person discussion at the summit, ideally also involving
more of the filesystem development community, so that we can reach
some consensus on what is the best apporach.

Good participants would be at least: Alexander Larsson, Giuseppe
Scrivano, Amir Goldstein, David Chinner, Gao Xiang, Miklos Szeredi,
Jingbo Xu.

[1] https://github.com/containers/composefs
[2] https://lore.kernel.org/lkml/cover.1674227308.git.alexl@redhat.com/
[3] https://lwn.net/SubscriberLink/922851/45ed93154f336f73/

-- 
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 Alexander Larsson                                            Red Hat,
Inc 
       alexl@redhat.com            alexander.larsson@gmail.com 
He's a lounge-singing crooked cowboy on his last day in the job. She's
a 
psychotic nymphomaniac single mother prone to fits of savage, 
blood-crazed rage. They fight crime!