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    SubjectRe: [PATCH] 2.6.11-mm1 "nobh" support for ext3 writeback mode
    Andrew Morton <> wrote:
    > page reclaim can come in, grab the page lock and
    > whip the page off the mapping.

    No it can't - we hold an additional ref on the page, so reclaim will back
    off. Still, it feels a bit flakey.

    And we're not supposed to take lock_page() inside journal_start, because
    that's a ranking violation. Probably i_sem will prevent an actual deadlock
    occurring, however.
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