NFSv4: Add accounting for the number of active delegations held

In order to better manage our delegation caching, add a counter
to track the number of active delegations.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2020-01-27 09:58:18 -05:00 • committed by Anna Schumaker
commit d2269ea14e