On 12/21/22 12:00, Lennart Poettering wrote: > On Mi, 21.12.22 10:03, Gerd Hoffmann (kra...@redhat.com) wrote: > >> For the general case we need some other option. Could be just stick to >> grub2 for those cases (we'll continue to need grub2 anyway for bios boot >> and ppc64le). Or drop an ext4 driver to /boot/efi/EFI/systemd/drivers, >> for example this one: >> https://github.com/tianocore/edk2-platforms/tree/master/Features/Ext4Pkg > > I am pretty strongly against the idea of ext4 for /boot/. > > First of all, the firmware can't read it natively, but what's worse, > uefi cannot even make sense of any of the features it provides above > vfat. i.e. file ownership, access modes, ACLs, selinux labels, xattrs, > symlinks, … are all complete nonsense to the UEFI fs layer (and to > boot loaders that natively implement the fs drivers, the same). The > UEFI fs API has no concepts for *any* of these features. Hence, if > this is supposed to carry data intended for consumption by the boot > loader, why the f**k would you use a file system it cannot even > remotely take benefit of? > > Also, I am pretty sure boot loaders should have the ability to make > changes to the file systems they read UKIs from, to implement boot > counting and random seed management. grub fs drivers and the stuff > derived thereof (i.e. efifs stuff) typically is read-only though. > > At least for the systemd stuff, we carefully made sure that our access > patterns to the ESP both from sd-boot/sd-stub and from userspace are > by default as minimal and robust as we can make them, to minimize > chance of corruption, given that vfat is not particularly good with > that. (i.e. we sync a lot, and the whole ESP mount is by default an > autofs instance with an extremely short idle timeout so that it > basically remains unmounted — and thus — clean during almost all > times). > > Anyway, if you want to know more about choice of the fs for /boot/, > see my ideas here: > > https://0pointer.net/blog/linux-boot-partitions.html > > Lennart
Does vfat support atomic rename? Is it possible to atomically upgrade a bootloader/UKI/etc? -- Sincerely, Demi Marie Obenour (she/her/hers) _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org 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@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
