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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: Wed, 29 Jan 2020 12:08:29 +1100
Message-ID: <20200129010829.GK18610@dread.disaster.area> (raw)
In-Reply-To: <20200125013553.24899-12-willy@infradead.org>

On Fri, Jan 24, 2020 at 05:35:52PM -0800, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
> 
> Use the new readahead operation in fuse.  Switching away from the
> read_cache_pages() helper gets rid of an implicit call to put_page(),
> so we can get rid of the get_page() call in fuse_readpages_fill().
> We can also get rid of the call to fuse_wait_on_page_writeback() as
> this page is newly allocated and so cannot be under writeback.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
.....
> @@ -968,19 +962,24 @@ static int fuse_readpages(struct file *file, struct address_space *mapping,
>  	data.max_pages = min_t(unsigned int, nr_pages, fc->max_pages);
>  ;
>  	data.ia = fuse_io_alloc(NULL, data.max_pages);
> -	err = -ENOMEM;
>  	if (!data.ia)
>  		goto out;
>  
> -	err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
> -	if (!err) {
> -		if (data.ia->ap.num_pages)
> -			fuse_send_readpages(data.ia, file);
> -		else
> -			fuse_io_free(data.ia);
> +	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;
	}

-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 [this message]
2020-01-30 21:35     ` Matthew Wilcox
2020-01-31  2:19       ` Dave Chinner
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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