Currently the repairDatabase command takes a global lock, see this code line.

I couldn't find a ticket to track the request to downgrade this to a database level lock, so here it is.

There is a comment referencing SERVER-4328 (db locking) that this is a "TODO" but currently the global lock "may" be necessary due to calling syncDataAndTruncateJournal.

After the storage changes we need to review if a downgrade to a db lock is an option. This would make repairs on a database much easier to handle from an operations point of view.