NFSv4: Ensure that we don't reap a delegation that is being returned

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/delegation.c

@@ -815,12 +815,14 @@ void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
 			inode = nfs_delegation_grab_inode(delegation);
 			if (inode == NULL)
 				continue;
+			delegation = nfs_start_delegation_return_locked(NFS_I(inode));
+			rcu_read_unlock();
+			if (delegation != NULL) {
 				delegation = nfs_detach_delegation(NFS_I(inode),
 					delegation, server);
-			rcu_read_unlock();
-
 				if (delegation != NULL)
 					nfs_free_delegation(delegation);
+			}
 			iput(inode);
 			goto restart;
 		}