linux-kernel - Question about do_wp_page() and lock

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Message-Id: <1231968908.3198.17.camel@dhcp-100-19-198.bos.redhat.com>
Date:	Wed, 14 Jan 2009 16:35:08 -0500
From:	Larry Woodman <lwoodman@...hat.com>
To:	linux-kernel@...r.kernel.org
Subject: Question about do_wp_page() and lock_page()

Why is it safe for do_wp_page() to call cow_user_page() without locking
the old_page first?  If a Direct IO read is outstanding on the old_page
or its the buffer to the file_read_actor() cant its contents change
during the COW fault?  Is this not a problem?

Larry Woodman

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