It's been discussed previously what the correct behaviour is when a
filesystem error is discovered. To provide some input, here's what
mount)ufs on Solaris 7 has to say about this:

               onerror=action
                         This option specifies  the  action  that
                         UFS  should  take  to  recover  from  an
                         internal inconsistency on a file system.
                         Specify action as panic, lock, or umount
                         . These values  cause  a  forced  system
                         shutdown,  a  file  system  lock  to  be
                         applied to the file system, or the  file
                         system to be forcibly unmounted, respec-
                         tively. The default is panic.


 - Hubert

-- 
Microsoft: "Where do you want to go today?"
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BSD:       "Are you guys coming, or what?"