Public bug reported:
(probably)/usr/lib/grub/x86_64-efi/ext2.mod, from:
grub-efi-amd64-bin:
Installed: 2.02-2ubuntu8.13
Candidate: 2.02-2ubuntu8.13
doesn't recognize an ext4 filesystem with metadata_csum set.
This is true in command-line grub, not just the update-grub software.
Attempting
linux (hdx,gptx)/vm etc on an ext4 fs with metadata_csum enabled fails;
removing the metadata_csum option fixes this.
Oddly enough it doesn't fail with this error, from grub-core/fs/ext2.c:
grub_error (GRUB_ERR_BAD_FS, "filesystem has unsupported incompatible
features");
I will recreate the bug and get a precise error message and append it.
I tried to install latest grub from eaon to see if upstream has fixed this, but
it depended on too much other unreleased software such as libc6.
I pulled the 2.04 source. There is nothing in the Changelog that appears
to address this.
from `man ext4`:
"metadata_csum
This ext4 feature enables metadata checksumming. This feature
stores checksums for all of the filesystem metadata (superblock, group
descriptor blocks, inode and block bitmaps, directories, and extent tree
blocks).
The checksum algorithm used for the metadata blocks is different
than the one used for group descriptors with the uninit_bg feature. These two
features are incompatible and metadata_csum will be used preferentially
instead of uninit_bg."
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: ext4 grub metadata-csum
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https://bugs.launchpad.net/bugs/1844012
Title:
grub2 doesn't recognize ext4 with metadata_csum enabled
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