On Thu, Jul 15, 2021 at 07:23:58AM +0100, Christoph Hellwig wrote:

quoted

 extern int filemap_check_errors(struct address_space *mapping);
 extern void __filemap_set_wb_err(struct address_space *mapping, int err);
+extern int filemap_fdatawrite_wbc(struct address_space *mapping,
+				  struct writeback_control *wbc);

No need for the extern here.

I'll remove it when applying the patch. There are many externs in the
file but also declaration without it so this one won't stand out.