** Summary changed:
- grub2 doesn't recognize ext4 with metadata_csum enabled
+ grub2 doesn't recognize ext4 with metadata_csum_seed enabled
** Description changed:
(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.
+ 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)/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:
+ The failure is "unrecognized filesystem" for any ext4 fs with
+ metadata_csum_seed set. Apparently saving the metata checksum seed in
+ the superblock changes it beyond recognition for grub.
- 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 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."
+ 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.
** Tags removed: metadata-csum
** Tags added: metadata-csum-seed
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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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