• relates to daemon/c8d: Unmount container fs after unclean shutdown #46770 (comment)

The current interface only allows Incrementing and Decrementing, but does not allow getting the current reference-count. As a result, we need to do implement confusing code to get the current count;

// Check if the refcount is non-zero.
m.rc.Increment(target)
if m.rc.Decrement(target) > 0 {
    // it's in use
}

We should look at a cleaner way to get this information without having to increment/decrement. Perhaps we don't need the actual count (only if in use?), but we can discuss that when working on this.