ext4 metadata_csum and backwards compatibility

[Lyn Perrine]

Well I can see option 3 being great if someone boots two different






































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































I think option 3 sounds good as being able to fsck when booting multiple
distros is quite important. Also if a distrohopper using 16.04 as base then
runs vms of multiple other things from their 16.04 base system they can
fsck all their vms on the desktop. I see this as helpful for anyone testing
from 16.04 as a base or having 16.04 installed beside the envelopment
release for testing when eating your own dogfood.





























On Wed, Mar 14, 2018 at 6:38 AM, Simon Deziel <simon.deziel at gmail.com>
wrote:

> On 2018-03-14 07:17 AM, Robie Basak wrote:
> > 3) We backport metadata_csum support to Xenial in an SRU[1] without
> > changing the default there. Xenial users will be able to fsck
> > Bionic-created ext4 filesystems. There will be forward compatibilty
> > problems when skipping across multiple LTSs (eg. Trusty accessing a
> > Bionic-created ext4 filesystem), but not across any single LTS.
>
> I'd vote for this ^, SRU to Xenial. When a new LTS arrives, I typically
> test it extensively in VMs running off of an hypervisor running the
> previous LTS. Being able to fsck the VM's filesystem is sometimes
> convenient. Also, since the metadata checksum was enabled in 16.10+ I'd
> rather not go back in terms of default enabled features, especially if
> this one is now production ready.
>
> Regards,
> Simon
>
>
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