nfsd: add an operation for unhashing a stateowner
Allow stateowners to be unhashed and destroyed when the last reference is put. The unhashing must be idempotent. In a future patch, we'll add some locking around it, but for now it's only protected by the client_mutex. Signed-off-by: NJeff Layton <jlayton@primarydata.com> Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
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