root@router:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 1.0M      1.0M         0 100% /rom
none                      7.0M         0      7.0M   0% /rom/mnt
none                      7.0M     48.0k      7.0M   1% /tmp
/dev/mtdblock/4           2.2M      2.1M     40.0k  98% /

root@router:~# mount
/dev/root on /rom type squashfs (ro)
none on /dev type devfs (rw)
none on /rom/mnt type tmpfs (ro)
none on /rom/mnt/proc type proc (rw)
none on /tmp type tmpfs (rw,nosuid,nodev)
none on /dev/pts type devpts (rw)
/dev/mtdblock/4 on / type jffs2 (rw)
none on /proc type proc (rw)