recreating ext4 journal: reboot required?

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http://serverfault.com – Most docs on disabling/creating the ext4 journal for root involve a reboot. If we: turn off the journal via tune2fs fsck the filesystem turn the journal back on via tune2fs fsck the filesystem then reboot Will that effectively re-create the journal? In this specific case we have a corrupted journal we wish to re-initialize. If we can eliminate the intervening reboot then we can better automate this process. I don't actually see why a reboot is required at any point? Thanks. (HowTos)