8929ab40f5
Those counters were abused for decade to workaround broken orphanization process in different classes by delaying the call while there are active requests. But from one side it did not close all the races, while from another was quite expensive on SMP due to trashing twice per request cache lines of consumer and provider and requiring locks. It lost its sense after I manually went through all the GEOM classes in base and made orphanization wait for either provider close or request completion. Consumer counters are still used under INVARIANTS to detect premature consumer close and detach. Provider counters are removed completely. Sponsored by: iXsystems, Inc.
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