Hi Cyril! On Sat, Jul 11, 2020 at 11:15:03PM +0200, Cyril Brulebois wrote: > Hi Nicholas, > > Nicholas D Steeves <nsteeves@gmail.com> (2020-07-10): > > My plan is thus: > > > > 1. After we have installation to subvolumes, add subvolume listing support to the rescue cd. This has the side-effect of being able to test "boot environments" from the rescue cd. > > 2. Activate boot environment support via grub-btrfs (#941627). > > 3. Long-term: add debian-installer support for user-configurable subvolume layout like Fedora and OpenSUSE have. Ideally I'd like to work on this as part of a btrfs-enablement team > > > > Thanks, > > Nicholas > > > > CCing Cyril for Kibi ACK :-) > > Please don't block on me. I'd assume you have much more experience with > btrfs than I do, and I'm not really concerned about possible breakages > with that particular filesystem (upon checking, it appears it doesn't > even appear in the installation guide for some reason). > Sorry for the delay replying, this was a case of "gmail silently ate/bounced your email" :-( Re: installation-guide: If I remember correctly someone recommended striking mention of btrfs from the installation guide because they believed the fs was RC buggy. Given that Fedora 33 is allegedly going to default to btrfs (with subvolumes for rootfs and home), for real this time, I think it's clear that this is no longer a just assessment. Thank you, I appreciate your vote of confidence! :-) The most significant potential issue I'm aware of is if Debian begins to default to using a persistent journald. Upstream journald defaults to using "chattr +C" (eg: nocow, no checksums, no protection), and there was a historical bug where this combination caused problems, but given the Fedora news I think it's fair to suppose that this potential issue has been resolved upstream. I'll wait a month to Andrew Hayzen a chance to test, then retest, then merge. Oh, and there is a fourth long-long-term objective: enabling advanced btrfs features such as btrfs-native raid profiles and compression in the installer. This one is without a shadow of a doubt post-bullseye, because util-linux and coreutils aren't yet sufficiently aware of btrfs' freespace accounting peculiarities when using these features (said another way, btrfs doesn't export expected info). I'm not blaming one group or the other, just saying I don't believe these features are not yet "Debian stable" quality in terms of user experience. I expect it will be ready for bookworm! Ideally I hope Adam Borowski, Hideki Yamane, and maybe Andrew Hayzen help found the future btrfs-enablement team :-) Cheers, Nicholas
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