> + /*
> + * WB_SYNC_NONE is opportunistic writeback. If this allocation fails,
> + * bdi_queue_work() will wake up the thread and flush old data. This
> + * should ensure some amount of progress in freeing memory.
> + */
> + if (wbc->sync_mode != WB_SYNC_ALL) {
> + struct bdi_work *w = bdi_alloc_work(wbc);
>
> + bdi_queue_work(wbc->bdi, w);
> + } else {
> + struct bdi_work work;
>
> + bdi_work_init(&work, wbc);
> + work.state |= WS_ONSTACK;
>
> + bdi_queue_work(wbc->bdi, &work);
> + bdi_wait_on_work_clear(&work);
That's even nice than my version, great.
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