** Description changed:
/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_seed set.
This is true in command-line grub, not just the update-grub software.
Attempting
- linux (hdx,gptx)/ etc on an ext4 fs with metadata_csum enabled fails;
- removing the metadata_csum_seed option fixes this.
+ linux (hdx,gptx)/ etc
- The failure is "unknown filesystem" for any ext4 fs with metadata_csum_seed
set. Apparently saving the metadata checksum seed in the superblock changes it
beyond recognition for grub. The message appears to be coming from
+ on an ext4 fs with metadata_csum enabled fails; removing the
+ metadata_csum_seed option fixes this.
+
+ The failure is "unknown filesystem" for any ext4 fs with
+ metadata_csum_seed set. Apparently saving the metadata checksum seed in
+ the superblock changes it beyond recognition for grub.
+
+ The message appears to be coming from
grub-2.04/grub-core/kern /fs.c:
grub_fs_t
grub_fs_probe (grub_device_t device)
{....
grub_error (GRUB_ERR_UNKNOWN_FS, N_("unknown filesystem"));
}
which appears to probe for filesystems by calling the fs modules to attempt
to mount 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_seed
This feature allows the filesystem to store the metadata
checksum seed in the superblock, which allows the administrator to change the
UUID of a filesystem using the metadata_csum feature while it is mounted.
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https://bugs.launchpad.net/bugs/1844012
Title:
grub2 doesn't recognize ext4 with metadata_csum_seed enabled
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