On Fri, Oct 10, 2025 at 2:02 PM Chris Adams <[email protected]> wrote: > > Once upon a time, Chris Murphy <[email protected]> said: > > As it turns out, GRUB does not do log replay for ext4, XFS or Btrfs. > > Yep, I got bit by this once when I did updates and then something (don't > know what) happened that caused the grub2.cfg update (pre BLS) to still > be in the XFS log. The system would just boot to a grub prompt... I was > on a trip and sitting in a hotel room (so no access to another system, a > rescue USB drive, etc.), and basically hadn't had to mess much with boot > loaders in a long time, so didn't really remember any GRUB2 commands. I > eventually puzzled out enough to get the system booted, but it was a bit > of a pain. > > The ideal solution would be for the GRUB2 (or any boot loader) FS > drivers to be able to do journal or log replay in a memory overlay (no > writes to the disk, so if there's a problem the boot loader wouldn't > make it worse), but that's a very non-trivial exercise, plus could take > a good bit more RAM. >
At least with Btrfs, there is dedicated header space for bootloader blobs and configuration. We currently cannot use this for grubenv, but there is a patch to make it possible. Additionally, we should probably start moving to static grub configuration shipped by the package rather than having it dynamically generated by Anaconda on the fly. It's also possible to use GRUB for s390x too, as the SUSE folks already do this. I'm not sure why we don't do that in Fedora. There's a few other things we can do to improve things too, it's just working out how to implement them across the board. -- 真実はいつも一つ！/ Always, there's only one truth! -- _______________________________________________ devel mailing list -- [email protected] To unsubscribe send an email to [email protected] Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/[email protected] Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
