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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?

It would be acceptable to me in principle, but I don't expect it to be an
"easy" SRU to do.

-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                    http://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org
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