NFSv4: Ensure client submounts when following a referral

Set up mountpoint when hitting a referral on moved error by getting
fs_locations.

Signed-off-by: Manoj Naik <manoj@almaden.ibm.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index a34b3ee..09271b1 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -317,6 +317,8 @@
 					const struct dentry *dentry,
 					struct nfs_fh *fh,
 					struct nfs_fattr *fattr);
+extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent,
+					struct dentry *dentry);
 
 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 extern u32 root_nfs_parse_addr(char *name); /*__init*/