How can I see the file system disk space usage in PlutoSDR?

Hi,

I would like to know the disk usage in Pluto. If I issue "df -h" I get these results:

# df -h
Filesystem                Size      Used Available Use% Mounted on
devtmpfs                117.7M         0    117.7M   0% /dev
tmpfs                   248.8M         0    248.8M   0% /dev/shm
tmpfs                   248.8M     32.0K    248.8M   0% /tmp
tmpfs                   248.8M     44.0K    248.8M   0% /run
mtd2                    896.0K    196.0K    700.0K  22% /mnt/jffs2

Which is strange because the usage is always 0% and the avaliable never changes regardless of what I upload.

Thanks!