[Linux] Filesystem mounts

[linux@flux.org]

Hello All:
I've run into this problem before but can't remember the exact Google  
incantation I used to get the answer:

I have a filesystem mounted at /foo/bar. At some point the filesystem  
might have been unmounted. Files that would normally go to the  
/foo/bar filesystem would then end up being written to the ./bar  
directory located on the /foo filesystem.

Question is, without unmount /foo/bar, how can I view the directory  
contents of the mount point /foo/bar.