linux-ext4 - Re: [PATCH] ext4: hold page lock when checking mapping in ext4_page

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Message-ID: <20110719021328.GA11918@infradead.org>
Date:	Mon, 18 Jul 2011 22:13:28 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Josef Bacik <josef@...hat.com>
Cc:	linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH] ext4: hold page lock when checking mapping in
 ext4_page_mkwrite

On Mon, Jul 18, 2011 at 11:59:32AM -0400, Josef Bacik wrote:
> Pages can be evicted from cache outside of truncate, for example when
> invalidating pages after writing with O_DIRECT.  The only proper way to check
> page->mapping is under the page lock, so fix ext4_page_mkwrite to do this.
> Thanks,

Josef, please check the ext4_page_mkwrite implementation in the vfs
tree, which is just a wrapper around the generic code and thus shouldn't
have this problem any more.
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