on 12/09/2013 10:36 Konstantin Belousov said the following: > UFS carefully disables shared locking for > VFIFO, but it seems ZFS is not. In fact, ZFS should do that since r253603 (MFC-ed to stables as r254694 and r254695): http://svnweb.freebsd.org/changeset/base/253603 If it still doesn't then it's a bug. -- Andriy Gapon