root用の予備燃料タンクの割合を指定するのはmkfsだっけ
ext*の場合はtune2fsだったようです
$ sudo tune2fs -l /dev/nvme0n1p2 | grep ReservedReserved block count: 3046233Reserved GDT blocks: 1024Reserved blocks uid: 0 (user root)Reserved blocks gid: 0 (group root)
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