On Wed, Jun 15, 2022 at 11:48:15PM +0200, Jan Kara wrote: > +extern int bdi_init(struct backing_dev_info *bdi); No need for the extern. Otherwise looks good: Reviewed-by: Christoph Hellwig <hch@xxxxxx> And this remind me that I really want to kill noop_backing_dev_info and just use a NULL bdi for this case eventually..