On Thu, Apr 01, 2021 at 08:05:37AM +0100, Christoph Hellwig wrote: > On Wed, Mar 31, 2021 at 07:47:01PM +0100, Matthew Wilcox (Oracle) wrote: > > - Mirror members of struct page (for pagecache / anon) into struct folio, > > so (eg) you can use folio->mapping instead of folio->page.mapping > > Eww, why? So that eventually we can rename page->mapping to page->_mapping and prevent the bugs from people doing page->mapping on a tail page. eg https://lore.kernel.org/linux-mm/alpine.LSU.2.11.2103102214170.7159@eggly.anvils/
