/sys/devices/virtual/bdi/
/sys/devices/virtual/bdi
NameSizeModeActions
7:0/-0755rm
7:1/-0755rm
7:2/-0755rm
7:3/-0755rm
7:4/-0755rm
7:5/-0755rm
7:6/-0755rm
7:7/-0755rm
202:0/-0755rm
Delete 7:4 ?
cmd: