jbd2 headache

[Doug Wyatt]

Running F17:

I have a 2TB HD with 1463 pending bad blocks, 0 reallocated so far.
All the data has been moved to another HD, the problem HD unmounted.
Full SMART scan verified the pending bad blocks.

However, I can't run badblocks on /dev/sdc1 because it is "apparently
in use".  lsof tells me there are 3 instances of jbd2/sdc1.

It should be no problem to use -f with badblocks in this case, but
is there any way to stop jdb2 from accessing the unmounted partition?

Thanks for any help you can provide.
Doug Wyatt