Remove reference count check in disconnect.  All callers will call decref() later, which will do the real disconnect if the reference count drops to zero. And all disconnect called from the decref() uses the HIGHLEVEL flag, so the flags fields is not really affected there.  I manually stop mds/ios/client wtihout seeing any issues.
Remove reference count check in disconnect.  All callers will call decref()
later, which will do the real disconnect if the reference count drops to zero.
And all disconnect called from the decref() uses the HIGHLEVEL flag, so the
flags fields is not really affected there.  I manually stop mds/ios/client
wtihout seeing any issues.

pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable