block: blk-mq: support draining mq queue
blk_mq_drain_queue() is introduced so that we can drain mq queue inside blk_cleanup_queue(). Also don't accept new requests any more if queue is marked as dying. Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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b28bc9b38c
Коммит
43a5e4e219
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@ -38,6 +38,7 @@
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#include "blk.h"
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#include "blk-cgroup.h"
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#include "blk-mq.h"
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_remap);
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EXPORT_TRACEPOINT_SYMBOL_GPL(block_rq_remap);
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@ -497,8 +498,13 @@ void blk_cleanup_queue(struct request_queue *q)
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* Drain all requests queued before DYING marking. Set DEAD flag to
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* prevent that q->request_fn() gets invoked after draining finished.
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*/
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spin_lock_irq(lock);
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__blk_drain_queue(q, true);
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if (q->mq_ops) {
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blk_mq_drain_queue(q);
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spin_lock_irq(lock);
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} else {
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spin_lock_irq(lock);
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__blk_drain_queue(q, true);
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}
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queue_flag_set(QUEUE_FLAG_DEAD, q);
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spin_unlock_irq(lock);
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@ -60,6 +60,10 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
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rq->rq_disk = bd_disk;
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rq->end_io = done;
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/*
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* don't check dying flag for MQ because the request won't
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* be resued after dying flag is set
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*/
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if (q->mq_ops) {
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blk_mq_insert_request(q, rq, true);
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return;
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@ -106,10 +106,13 @@ static int blk_mq_queue_enter(struct request_queue *q)
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spin_lock_irq(q->queue_lock);
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ret = wait_event_interruptible_lock_irq(q->mq_freeze_wq,
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!blk_queue_bypass(q), *q->queue_lock);
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!blk_queue_bypass(q) || blk_queue_dying(q),
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*q->queue_lock);
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/* inc usage with lock hold to avoid freeze_queue runs here */
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if (!ret)
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if (!ret && !blk_queue_dying(q))
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__percpu_counter_add(&q->mq_usage_counter, 1, 1000000);
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else if (blk_queue_dying(q))
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ret = -ENODEV;
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spin_unlock_irq(q->queue_lock);
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return ret;
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@ -120,6 +123,22 @@ static void blk_mq_queue_exit(struct request_queue *q)
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__percpu_counter_add(&q->mq_usage_counter, -1, 1000000);
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}
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static void __blk_mq_drain_queue(struct request_queue *q)
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{
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while (true) {
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s64 count;
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spin_lock_irq(q->queue_lock);
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count = percpu_counter_sum(&q->mq_usage_counter);
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spin_unlock_irq(q->queue_lock);
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if (count == 0)
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break;
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blk_mq_run_queues(q, false);
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msleep(10);
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}
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}
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/*
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* Guarantee no request is in use, so we can change any data structure of
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* the queue afterward.
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@ -133,21 +152,13 @@ static void blk_mq_freeze_queue(struct request_queue *q)
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queue_flag_set(QUEUE_FLAG_BYPASS, q);
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spin_unlock_irq(q->queue_lock);
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if (!drain)
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return;
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if (drain)
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__blk_mq_drain_queue(q);
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}
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while (true) {
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s64 count;
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spin_lock_irq(q->queue_lock);
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count = percpu_counter_sum(&q->mq_usage_counter);
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spin_unlock_irq(q->queue_lock);
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if (count == 0)
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break;
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blk_mq_run_queues(q, false);
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msleep(10);
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}
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void blk_mq_drain_queue(struct request_queue *q)
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{
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__blk_mq_drain_queue(q);
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}
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static void blk_mq_unfreeze_queue(struct request_queue *q)
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@ -27,6 +27,7 @@ void blk_mq_complete_request(struct request *rq, int error);
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void blk_mq_run_request(struct request *rq, bool run_queue, bool async);
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void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
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void blk_mq_init_flush(struct request_queue *q);
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void blk_mq_drain_queue(struct request_queue *q);
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/*
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* CPU hotplug helpers
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