nfsd4: add new connections to session

As long as we're not implementing any session security, we should just
automatically add any new connections that come along to the list of
sessions associated with the session.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4state.c

@@ -658,13 +658,18 @@ static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp)
 	return conn;
 }
 
+static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
+{
+	conn->cn_session = ses;
+	list_add(&conn->cn_persession, &ses->se_conns);
+}
+
 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
 {
 	struct nfs4_client *clp = ses->se_client;
 
 	spin_lock(&clp->cl_lock);
-	conn->cn_session = ses;
-	list_add(&conn->cn_persession, &ses->se_conns);
+	__nfsd4_hash_conn(conn, ses);
 	spin_unlock(&clp->cl_lock);
 }
 
@@ -1612,6 +1617,44 @@ nfsd4_destroy_session(struct svc_rqst *r,
 	return status;
 }
 
+static struct nfsd4_conn *__nfsd4_find_conn(struct svc_rqst *r, struct nfsd4_session *s)
+{
+	struct nfsd4_conn *c;
+
+	list_for_each_entry(c, &s->se_conns, cn_persession) {
+		if (c->cn_xprt == r->rq_xprt) {
+			return c;
+		}
+	}
+	return NULL;
+}
+
+static void nfsd4_sequence_check_conn(struct svc_rqst *rqstp, struct nfsd4_session *ses)
+{
+	struct nfs4_client *clp = ses->se_client;
+	struct nfsd4_conn *c, *new = NULL;
+
+	spin_lock(&clp->cl_lock);
+	c = __nfsd4_find_conn(rqstp, ses);
+	spin_unlock(&clp->cl_lock);
+	if (c)
+		return;
+
+	new = alloc_conn(rqstp);
+
+	spin_lock(&clp->cl_lock);
+	c = __nfsd4_find_conn(rqstp, ses);
+	if (c) {
+		spin_unlock(&clp->cl_lock);
+		free_conn(new);
+		return;
+	}
+	__nfsd4_hash_conn(new, ses);
+	spin_unlock(&clp->cl_lock);
+	nfsd4_register_conn(new);
+	return;
+}
+
 __be32
 nfsd4_sequence(struct svc_rqst *rqstp,
 	       struct nfsd4_compound_state *cstate,
@@ -1656,6 +1699,8 @@ nfsd4_sequence(struct svc_rqst *rqstp,
 	if (status)
 		goto out;
 
+	nfsd4_sequence_check_conn(rqstp, session);
+
 	/* Success! bump slot seqid */
 	slot->sl_inuse = true;
 	slot->sl_seqid = seq->seqid;