dd-wrt disk space

root@DD-WRT:~# uname -a
Linux DD-WRT 2.6.23.17 #3579 Sat Aug 7 09:08:09 CEST 2010 mips unknown
root@DD-WRT:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 2.8M      2.8M         0 100% /
root@DD-WRT:~# du / -hs
9.1M
root@DD-WRT:~# cat /etc/fstab
/dev/root / ext2 defaults 1 1