On Mi, 21.12.22 12:53, Fedora Development ML (devel@xxxxxxxxxxxxxxxxxxxxxxx) wrote: > On 21/12/2022 12:38, Daniel P. Berrangé wrote: > > Why shouldn't FAT be used for /boot. In an EFI world, /boot > > is used for the same functional pupose as the ESP, which is > > already going to use FAT. > > Doesn't support links, lournaling and ACLs. What you want in a boot loader: native read access, write access. What UEFI doesn't have any understanding of and just ignores: symlinks, ACLs. What grub's fs drivers doesn't even implement: journalling, write access. hence, ext4 via efis might be OK as a compat solution, but it delivers only stuff one doesn't want, and lacks everything one does want. > Everyone can do whatever they want with the files, and a trivial power > outage can easily wipe out all of its contents. As mentioned elsewhere, write access to the ESP are generally done at a very limited set of operations: 1. new kernel installed/old one removed 2. boot loader updates 3. random seed refreshes 4. boot counter updates All of these are extremely simple operations, that either are single sector writes, or implemented via whole file replacement, which typically can be implemented robustly even on vfat. i.e there's no long-running access, no random access, nothing like that. systemd's autofs logic for the ESP (and the write patterns bootctl implements) are designed to give you data safety for the ESP to the level this could be possible. Sure, it's still no journalling, but it's as close as it can get. -- Lennart Poettering, Berlin _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx 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/devel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
