diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 12787a9..2516ade 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -291,6 +291,7 @@
 /*
  * linux/fs/nfs/inode.c
  */
+extern int nfs_sync_mapping(struct address_space *mapping);
 extern void nfs_zap_caches(struct inode *);
 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 				struct nfs_fattr *);