tune2fs - is used to manipulate the filesystem parameters of a ext 2/3/4 type file system syntax $ sudo tune2fs option device
To list file system parameters $ sudo tune2fs -l /dev/vda1
Reserved Block Percentage: This parameter specifies the percentage of disk space reserved for the root user.
By default when a ext2/3/4 filesystem is created, it reserves 5% for the root user. This behaviour can be changed by regaining the 5% reserved space using the below option.
$sudo tune2fs -m 0 /dev/sda5