NFSv4.1: Handle NFS4ERR_BADSESSION/NFS4ERR_DEADSESSION replies to OP_SEQUENCE

In the case where SEQUENCE receives a NFS4ERR_BADSESSION or
NFS4ERR_DEADSESSION error, we just want to report the session as needing
recovery, and then we want to retry the operation.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/nfs4proc.c

@@ -816,6 +816,10 @@ static int nfs41_sequence_process(struct rpc_task *task,
 	case -NFS4ERR_SEQ_FALSE_RETRY:
 		++slot->seq_nr;
 		goto retry_nowait;
+	case -NFS4ERR_DEADSESSION:
+	case -NFS4ERR_BADSESSION:
+		nfs4_schedule_session_recovery(session, res->sr_status);
+		goto retry_nowait;
 	default:
 		/* Just update the slot sequence no. */
 		slot->seq_done = 1;