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

[Dmitriy Geels]

Results (using btrfs-compsize tool):

$ sudo compsize /boot/ /bin/ /usr/
Processed 240794 files, 88025 regular extents (89183 refs), 162022 inline.
Type       Perc     Disk Usage   Uncompressed Referenced  
TOTAL       50%      2.7G         5.3G         5.4G       
none       100%      1.1G         1.1G         1.1G       
lzo         46%      9.1M          19M          19M       
zstd        37%      1.5G         4.1G         4.2G

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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:
  Triaged
Status in grub2 package in Arch Linux:
  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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