linux-kernel - Re: [PATCH v6 00/27] Memory Folios

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Date:   Thu, 1 Apr 2021 12:26:56 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-cachefs@...hat.com,
        linux-afs@...ts.infradead.org
Subject: Re: [PATCH v6 00/27] Memory Folios

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/