Check disk usage

df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        95G   82G  7.9G  92% /

Check size of Reserved block count

tune2fs -l /dev/vda1 | grep '^Reserved block count'
Reserved block count:     262143

Change Reserved block count to 0%

tune2fs -m 0 /dev/vda1
tune2fs 1.42.12 (29-Aug-2014)
Setting reserved blocks percentage to 0% (0 blocks)

tune2fs -l /dev/vda1 | grep '^Reserved block count'
Reserved block count:     0

Check disk usage

df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        95G   82G   13G  87% /