root full Linux. No free blocks

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http://serverfault.com – df -h reports the '/' partition to be 100% full. While running du -hs * on each directory of this partition shows there is still lot of space. tune2efs which reports just one block to be free. Ran fsck as well, which also shows all blocks being used. ionode use is 14% on the '/' partition. Please note that /var, /usr, /dev, /tmp, /home are mounted on different partitions and have space available in them. Can you please let me know the possible causes for all blocks to be occupied and disk reporting to be full even tough there is a lot of space. (HowTos)