determineFilesystemType func bug

[yuchunyun]

when kubelet mount volume, have error
Cannot determine filesystem type: err=exit status 2
So I enter lvmd that pod to execute
file-bsl /dev/volumegroup /pvc-xxxxxxxx
output
diy-thermocam raw data (Lepton 2.x), scale 0-246, spot sensor temperature 0.000000, unit Celsius, color scheme 0, calibration: Offset -0.001892, slope 0.046875
then I execute blkid -c /dev/ null-o export /dev/volumeGroup/pvc-xxxxxxxx without any return, but the return code is 2