linux-ext4 - Re: [PATCH v6 10/19] fs: Convert mpage_readpages to mpage

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Date:   Tue, 18 Feb 2020 19:47:41 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        Junxiao Bi <junxiao.bi@...cle.com>,
        linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-mm@...ck.org, ocfs2-devel@....oracle.com,
        linux-ext4@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
        linux-btrfs@...r.kernel.org
Subject: Re: [PATCH v6 10/19] fs: Convert mpage_readpages to mpage_readahead

On Tue, Feb 18, 2020 at 07:28:26PM -0800, Eric Biggers wrote:
> On Mon, Feb 17, 2020 at 10:45:58AM -0800, Matthew Wilcox wrote:
> > diff --git a/include/linux/mpage.h b/include/linux/mpage.h
> > index 001f1fcf9836..f4f5e90a6844 100644
> > --- a/include/linux/mpage.h
> > +++ b/include/linux/mpage.h
> > @@ -13,9 +13,9 @@
> >  #ifdef CONFIG_BLOCK
> >  
> >  struct writeback_control;
> > +struct readahead_control;
> >  
> > -int mpage_readpages(struct address_space *mapping, struct list_head *pages,
> > -				unsigned nr_pages, get_block_t get_block);
> > +void mpage_readahead(struct readahead_control *, get_block_t get_block);
> >  int mpage_readpage(struct page *page, get_block_t get_block);
> >  int mpage_writepages(struct address_space *mapping,
> >  		struct writeback_control *wbc, get_block_t get_block);
> 
> Can you name the 'struct readahead_control *' parameter?

What good would that do?  I'm sick of seeing 'struct page *page'.
Well, no shit it's a page.  Unless there's some actual information to
convey, leave the argument unnamed.  It should be a crime to not name
an unsigned long, but not naming the struct address_space pointer is
entirely reasonable.