NFSv4: fail nfs4_refresh_delegation_stateid() when the delegation was revoked

If the delegation was revoked, we don't want to retry the delegreturn.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/delegation.c

@@ -1190,7 +1190,8 @@ bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode)
 	rcu_read_lock();
 	delegation = rcu_dereference(NFS_I(inode)->delegation);
 	if (delegation != NULL &&
-	    nfs4_stateid_match_other(dst, &delegation->stateid)) {
+	    nfs4_stateid_match_other(dst, &delegation->stateid) &&
+	    !test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) {
 		dst->seqid = delegation->stateid.seqid;
 		ret = true;
 	}