I don't see a problem in the above. That df and du displays different
information is an FAQ. Does this reference help you?
That FAQ doesn't consider hardlinks. I suppose it should be updated
to mention the difference there too.
Thanks for your reply.
If you watched my first message, you can see difference between df and
du used space 237G vs 24G. There are no open deleted files. If I
unmount this filesystems and do fsck, du and df will show the same used