AFAIK you don't need subvolume id, `btrfs qgroup show -ref
/path/to/subvolume` shows necessary qgroup for me. Separating value you
need is more involved:
btrfs qgroup show -ref --raw /path/to/subvolume | tail -n +3 | tr -s '
' | cut -d ' ' -f 4
Not sure how robust is this though.
--
With Best Regards,
Marat Khalili
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