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From: Dave Chinner <david@fromorbit.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 11/12] fuse: Convert from readpages to readahead
Date: Fri, 31 Jan 2020 13:19:09 +1100
Message-ID: <20200131021909.GC18575@dread.disaster.area> (raw)
In-Reply-To: <20200130213533.GN6615@bombadil.infradead.org>

On Thu, Jan 30, 2020 at 01:35:33PM -0800, Matthew Wilcox wrote:
> On Wed, Jan 29, 2020 at 12:08:29PM +1100, Dave Chinner wrote:
> > On Fri, Jan 24, 2020 at 05:35:52PM -0800, Matthew Wilcox wrote:
> > > +	while (nr_pages--) {
> > > +		struct page *page = readahead_page(mapping, start++);
> > > +		int err = fuse_readpages_fill(&data, page);
> > > +
> > > +		if (!err)
> > > +			continue;
> > > +		nr_pages++;
> > > +		goto out;
> > >  	}
> > 
> > That's some pretty convoluted logic. Perhaps:
> > 
> > 	for (; nr_pages > 0 ; nr_pages--) {
> > 		struct page *page = readahead_page(mapping, start++);
> > 
> > 		if (fuse_readpages_fill(&data, page))
> > 			goto out;
> > 	}
> 
> I have a bit of an aversion to that style of for loop ... I like this
> instead:
> 
>         while (nr_pages) {
>                 struct page *page = readahead_page(mapping, start++);
> 
>                 if (fuse_readpages_fill(&data, page) != 0)
>                         goto out;
>                 nr_pages--;
>         }

yup, that's also fine.

-Dave.
-- 
Dave Chinner
david@fromorbit.com

  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-25  1:35 [PATCH 00/12] Change readahead API Matthew Wilcox
2020-01-25  1:35 ` [PATCH 01/12] mm: Fix the return type of __do_page_cache_readahead Matthew Wilcox
2020-01-25  1:35 ` [PATCH 02/12] readahead: Ignore return value of ->readpages Matthew Wilcox
2020-01-25  1:35 ` [PATCH 03/12] readahead: Put pages in cache earlier Matthew Wilcox
2020-01-25 19:44   ` Matthew Wilcox
2020-01-25  1:35 ` [PATCH 04/12] mm: Add readahead address space operation Matthew Wilcox
2020-01-25  3:57   ` Randy Dunlap
2020-02-01  0:25     ` Matthew Wilcox
2020-01-29  0:24   ` Dave Chinner
2020-01-30  8:00     ` Matthew Wilcox
2020-01-25  1:35 ` [PATCH 05/12] fs: Convert mpage_readpages to mpage_readahead Matthew Wilcox
2020-01-25  1:35 ` [PATCH 06/12] btrfs: Convert from readpages to readahead Matthew Wilcox
2020-01-29  0:46   ` Dave Chinner
2020-01-30  8:09     ` Matthew Wilcox
2020-01-31  2:17       ` Dave Chinner
2020-01-25  1:35 ` [PATCH 07/12] erofs: Convert uncompressed files " Matthew Wilcox
2020-01-25  1:53   ` Gao Xiang
2020-01-25 19:09     ` Matthew Wilcox
2020-01-29  0:57   ` Dave Chinner
2020-01-30  8:10     ` Matthew Wilcox
2020-01-25  1:35 ` [PATCH 08/12] erofs: Convert compressed " Matthew Wilcox
2020-01-25  1:35 ` [PATCH 09/12] ext4: Convert " Matthew Wilcox
2020-01-25  1:35 ` [PATCH 10/12] f2fs: " Matthew Wilcox
2020-01-25  1:35 ` [PATCH 11/12] fuse: " Matthew Wilcox
2020-01-29  1:08   ` Dave Chinner
2020-01-30 21:35     ` Matthew Wilcox
2020-01-31  2:19       ` Dave Chinner [this message]
2020-01-29 10:50   ` Miklos Szeredi
2020-01-30  7:26     ` Matthew Wilcox
2020-01-25  1:35 ` [PATCH 12/12] iomap: " Matthew Wilcox
2020-01-29  1:38   ` Dave Chinner
2020-01-31  9:44     ` Matthew Wilcox
2020-02-13  4:38 ` [PATCH 00/12] Change readahead API Andrew Morton
2020-02-13 13:43   ` Matthew Wilcox

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