2010/1/28 Michał Sawicz [off-list ref]:

If you do - remount the filesystem read-only (mount -o remount,ro). But
it would be best to use some LiveCD system, otherwise you will need to
resize on a live filesystem, it will take much more time and is more
dangerous than resizing offline.

If you can't take the fs offline - you can force resizing without fsck
first, but again - it would be best to fsck it and resize offline.

I can do "shutdown -r -F now" from my regular system. During this
reboot a fsck will be forced. Will that be enough?
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