linux-kernel - Re: [PATCH 3/6] folio: Add a function to get the host inode for a folio

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Message-ID: <1951630.1629814305@warthog.procyon.org.uk>
Date:   Tue, 24 Aug 2021 15:11:45 +0100
From:   David Howells <dhowells@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     dhowells@...hat.com, Jeff Layton <jlayton@...nel.org>,
        Ilya Dryomov <idryomov@...il.com>,
        linux-fsdevel@...r.kernel.org, linux-cachefs@...hat.com,
        linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
        linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net, devel@...ts.orangefs.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] folio: Add a function to get the host inode for a folio

Matthew Wilcox <willy@...radead.org> wrote:

> > +static inline struct inode *folio_inode(struct folio *folio)
> > +{
> > +	return folio_file_mapping(folio)->host;
> 
> You're contradicting yourself here.  If you're allowed to call this
> function for swap cache pages, then the documentation needs to change.
> If you're not, then we can just use folio->mapping->host.

Um.  I don't know.  I'll do the latter, then, for now.

David