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Date:   Wed, 12 Feb 2020 20:38:52 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-xfs@...r.kernel.org,
        cluster-devel@...hat.com, ocfs2-devel@....oracle.com
Subject: Re: [PATCH 00/12] Change readahead API

On Fri, 24 Jan 2020 17:35:41 -0800 Matthew Wilcox <willy@...radead.org> wrote:

> From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> 
> This series adds a readahead address_space operation to eventually
> replace the readpages operation.  The key difference is that
> pages are added to the page cache as they are allocated (and
> then looked up by the filesystem) instead of passing them on a
> list to the readpages operation and having the filesystem add
> them to the page cache.  It's a net reduction in code for each
> implementation, more efficient than walking a list, and solves
> the direct-write vs buffered-read problem reported by yu kuai at
> https://lore.kernel.org/linux-fsdevel/20200116063601.39201-1-yukuai3@huawei.com/

Unclear which patch fixes this and how it did it?

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