I routinely deal with Read Only file systems and always have to remember the commands to remove the journal and run a file system check. Since some days I am better at remembering than others, I thought I'd just write it down in this post so I can find it later.

First, remove the journal:

If you run into errors due to 'needs_recovery', do this to remove the recovery flag and then remove the journal as shown above:

Run the file system check. See how bad things are first.

If it's not too bad, do the real fsck.

Once the rebuild is successful and complete, rebuild the journal.

Mount the filesystem and make sure it's happy and ready for action.

Reboot the server and put it back in the fray.