linux-2.6.25/blk_plug_device() の履歴(No.1)

参照元†

linux-2.6.25/blk_start_queue()

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説明†

パス: linux-2.6.25/block/blk-core.c

これは何？
- 説明

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引数†

struct request_queue *q
- linux-2.6.25/request_queue

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返り値†

なし

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参考†

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実装†

/*
 * "plug" the device if there are no outstanding requests: this will
 * force the transfer to start only after we have put all the requests
 * on the list.
 *
 * This is called with interrupts off and no requests on the queue and
 * with the queue lock held.
 */
void blk_plug_device(struct request_queue *q)
{
        WARN_ON(!irqs_disabled());

        /*
         * don't plug a stopped queue, it must be paired with blk_start_queue()
         * which will restart the queueing
         */
        if (blk_queue_stopped(q))
                return;

        if (!test_and_set_bit(QUEUE_FLAG_PLUGGED, &q->queue_flags)) {
                mod_timer(&q->unplug_timer, jiffies + q->unplug_delay);
                blk_add_trace_generic(q, NULL, 0, BLK_TA_PLUG);
        }
}
EXPORT_SYMBOL(blk_plug_device);

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linux-2.6.25/blk_plug_device() の履歴(No.1)

参照元†

説明†

引数†

返り値†

参考†

実装†

コメント†