Comment 4 for bug 1844012

Note that this is not limited to metadata_csum_seed, other "recently" added ext4 features cannot be used on the system partition (and maybe the whole system disk, if you have other ext4 partitions there with such features).

At least confirmed to not work with GRUB:

- metadata_csum_seed
- ea_inode
- large_dir
- casefold