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ext4 metadata_csum and backwards compatibility

On Mon, Mar 19, 2018 at 01:33:12PM +0000, Robie Basak wrote:
> 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.

I think it might be useful to snap e2fsprogs, so we have a solution
for all older releases. Not to replace the package, but as a backport
that does not conflict with the system binaries.

Or introduce e2fsprogs-hwe packages to match the hwe kernel which
support the new features.

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