mkfs -t ext4 -q /dev/vdc mkfs -t ext4 -q /dev/vdb mkfs -t ext4 -q /dev/vda mkfs -t ext4 -q /dev/vdd mount -t ext4 /dev/vda /fs/vda mount -t ext4 /dev/vdb /fs/vdb mount -t ext4 /dev/vdc /fs/vdc mount -t ext4 /dev/vdd /fs/vdd export TEST_DIR=/fs/vda export TEST_DEV=/dev/vda export SCRATCH_MNT=/fs/scratch mkdir /fs/scratch -p export SCRATCH_DEV=/dev/vdd ./check ext4/271 ext4/301 ext4/305