diff --git a/mm/readahead.c b/mm/readahead.c
index 4a60cdb64262..38635af5bab7 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -508,6 +508,7 @@ void page_cache_ra_order(struct readahead_control *ractl,
 			new_order--;
 	}
 
+	filemap_invalidate_lock_shared(mapping);
 	while (index <= limit) {
 		unsigned int order = new_order;
 
@@ -534,6 +535,7 @@ void page_cache_ra_order(struct readahead_control *ractl,
 	}
 
 	read_pages(ractl);
+	filemap_invalidate_unlock_shared(mapping);
 
 	/*
 	 * If there were already pages in the page cache, then we may have