[Bug 1751517] Re: ubuntu bionic grub can't boot zstd compressed filesystem

[en]

possible workaround:
Patch all btrfs-tools so that they don't compress files accessed by grub with zstd.

pitfall:
If users repair the filesystem from a live-cd, (eg. run defragmentation), they must make sure that they don't compress files acessed by grub with zstd.

Another option:
Archlinux uses this patched grub version:

https://github.com/Antynea/grub-btrfs

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https://bugs.launchpad.net/bugs/1751517

Title:
  ubuntu bionic grub can't boot zstd compressed filesystem

Status in grub2 package in Ubuntu:
  New

Bug description:
  In the /etc/fstab of installed ubuntu bionic system I specified compress=zstd for the btrfs root filesytem
  After runing 'sudo btrfs filesystem defragment -r -czstd /' the system booted to a grub shell.  I could boot again by running 'sudo btrfs filesystem defragment -r -clzo /' and specifying compress=lzo in the /etc/fstab.
  There is also a new bug in the btrfs tools:
  btrfs does recognize the option '-clzo' but not '-c lzo'.

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