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    Subject[PATCH 42/51] writeback: make wakeup_dirtytime_writeback() handle multiple bdi_writeback's
    Date
    wakeup_dirtytime_writeback() currently only starts writeback on the
    root wb (bdi_writeback). For cgroup writeback support, update the
    function to check all wbs.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    Cc: Jens Axboe <axboe@kernel.dk>
    Cc: Jan Kara <jack@suse.cz>
    Cc: Theodore Ts'o <tytso@mit.edu>
    ---
    fs/fs-writeback.c | 9 ++++++---
    1 file changed, 6 insertions(+), 3 deletions(-)

    diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
    index 508e10c..8ae212e 100644
    --- a/fs/fs-writeback.c
    +++ b/fs/fs-writeback.c
    @@ -1260,9 +1260,12 @@ static void wakeup_dirtytime_writeback(struct work_struct *w)

    rcu_read_lock();
    list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {
    - if (list_empty(&bdi->wb.b_dirty_time))
    - continue;
    - wb_wakeup(&bdi->wb);
    + struct bdi_writeback *wb;
    + struct wb_iter iter;
    +
    + bdi_for_each_wb(wb, bdi, &iter, 0)
    + if (!list_empty(&bdi->wb.b_dirty_time))
    + wb_wakeup(&bdi->wb);
    }
    rcu_read_unlock();
    schedule_delayed_work(&dirtytime_work, dirtytime_expire_interval * HZ);
    --
    2.4.0


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