linux-kernel - Re: [PATCH v8 06/63] btrfs: Use filemap_range_has

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Message-ID: <20180307141720.GA23693@twin.jikos.cz>
Date:   Wed, 7 Mar 2018 15:17:20 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org,
        Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>,
        linux-nilfs@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH v8 06/63] btrfs: Use filemap_range_has_page()

On Tue, Mar 06, 2018 at 11:23:16AM -0800, Matthew Wilcox wrote:
> From: Matthew Wilcox <mawilcox@...rosoft.com>
> 
> The current implementation of btrfs_page_exists_in_range() gives the
> wrong answer if the workingset code has stored a shadow entry in the
> page cache.  The filemap_range_has_page() function does not have this
> problem, and it's shared code, so use it instead.

I'm going to merge this patch. btrfs_page_exists_in_range was full of
bugs from the beginning so I'm more than happy to use the shared one.
Thanks.