nfs41: recover lease in _nfs4_lookup_root

This creates the nfsv4.1 session on mount.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

3 files changed, 25 insertions, 1 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,
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 78508f29c03a..acee3274d275 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -114,6 +114,7 @@ extern struct nfs_server *nfs_clone_server(struct nfs_server *,
                                            struct nfs_fh *,
                                            struct nfs_fattr *);
 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
+extern int nfs4_check_client_ready(struct nfs_client *clp);
 #ifdef CONFIG_PROC_FS
 extern int __init nfs_fs_proc_init(void);
 extern void nfs_fs_proc_exit(void);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 64d611658d1f..31ce758d53d5 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2024,8 +2024,15 @@ static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
                 .rpc_argp = &args,
                 .rpc_resp = &res,
         };
+        int status;
+
         nfs_fattr_init(info->fattr);
-        return nfs4_call_sync(server, &msg, &args, &res, 0);
+        status = nfs4_recover_expired_lease(server);
+        if (!status)
+                status = nfs4_check_client_ready(server->nfs_client);
+        if (!status)
+                status = nfs4_call_sync(server, &msg, &args, &res, 0);
+        return status;
 }
 
 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,