Hi, Il giorno mer, 13/01/2021 alle 13.46 -0700, Chris Murphy ha scritto: > On Tue, Jan 12, 2021 at 8:48 PM Michel Alexandre Salim > <michel@xxxxxxxxxxxxxxx> wrote: ... snip > There are separate issues. > > grubenv is "OK" on ext4 and XFS. The issue is that none of the file > systems developers like anything other than kernel code doing writes. > One idea for this is a new MBR and GPT partition type, functionally > identical to the GPT "BIOS Boot" type, that's exclusively for the > bootloader to use however it wants. On BIOS it'd include core.img and > grubenv. On UEFI it'd just be used for grubenv. This issue needs to > be > taken upstream to sort out the details, so it should be set aside as > it relates to this proposal. IMHO boot loaders should not write to filesystems, if this is needed to hide the GRUB menu when boot is successful, then let's display it always as it was one time. I don't think it we should follow Windows or MacOS style here, the boot menu is useful. > The issue with journaled file systems is that GRUB's file system > drivers have no ability to do journal replay. Therefore there is a > small risk the file system is rendered unbootable in a crash, because > the bootloader only sees the no-replay state of the file system used > for /boot. e.g. the bootloader can see grub.cfg, bls snippets, or > even > the kernel as either missing or as 0 length files, until the journal > has been replayed. Small risk, big penalty. My suggestion for > mitigation is to use FAT for /boot in simple cases, and Btrfs in less > simple cases. It's just an idea, it's not urgent, but if things are > being reconsidered for simplification anyway, this makes sense to me. > > Ergo the idea for a "bootloader partition that is exclusively owned > by > the bootloader" is separate from "bootloaders don't do journal replay > and therefore can have the wrong view of things, and fail to boot in > rare cases following a crash." Yet another partition needed to boot the OS. What when there are no available paritions in BIOS mode, because other OSes used all the available 4 partitions? ... snip Ciao Guido
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