}
		debugPrintf("register %s cas2 failed %p %p\n", c.Name(), f.counters.Load(), head)
	}
}

// invalidateCounters marks as invalid all the pointers
// held by f's counters and then refreshes them.
//
// invalidateCounters cannot be called while holding f.mu,
// because a counter refresh may call f.lookup.
func (f *file) invalidateCounters() {
	// Mark every counter as needing to refresh its count pointer.