1 files changed, 16 insertions, 0 deletions

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index d28a987f569e..3e232bf56dfb 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -528,6 +528,22 @@ void nfs_mark_client_ready(struct nfs_client *clp, int state)
 }
 
 /*
+ * With sessions, the client is not marked ready until after a
+ * successful EXCHANGE_ID and CREATE_SESSION.
+ *
+ * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
+ * other versions of NFS can be tried.
+ */
+int nfs4_check_client_ready(struct nfs_client *clp)
+{
+        if (!nfs4_has_session(clp))
+                return 0;
+        if (clp->cl_cons_state < NFS_CS_READY)
+                return -EPROTONOSUPPORT;
+        return 0;
+}
+
+/*
  * Initialise the timeout values for a connection
  */
 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,