ext4 metadata_csum and backwards compatibility

[Robie Basak]

On Wed, Mar 14, 2018 at 09:49:17PM -0700, Steve Langasek wrote:
> It's not ideal for an interface to go from unsupported to mandatory in a
> single LTS cycle; but I don't believe that the use case of creating a
> filesystem with one LTS release, then interacting with it using the
> userspace tools from a previous LTS release, is significant enough to
> justify holding back features that upstream has recommended as the default.
> 
> I think it suffices to document this in the release notes.

Thanks. What's your opinion on an SRU to Xenial and/or to Trusty that
allows e2fsprogs to understand the future filesystem feature? Assuming
that no default behaviour would be changed for stable release users,
would this be acceptable to you in principle?

To the rest of the SRU team: any objections to somebody driving this?
I'm not necessarily committing to this wearing my Canonical Server Team
hat, but "enyc" in #ubuntu-devel seems quite interested in driving an
SRU, so it would be useful to get opinions now to avoid any wasted work.

Robie
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