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Commit 1bcb1ead authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe
Browse files

blk-mq: allocate flush_rq in blk_mq_init_flush() 



It is reasonable to allocate flush req in blk_mq_init_flush().

Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMing Lei <ming.lei@canonical.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 08e98fc6

block/blk-flush.c

+10 −1
Original line number Diff line number Diff line
@@ -472,7 +472,16 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, 
}

EXPORT_SYMBOL(blkdev_issue_flush);



void blk_mq_init_flush(struct request_queue *q)

int blk_mq_init_flush(struct request_queue *q)

{

	struct blk_mq_tag_set *set = q->tag_set;



	spin_lock_init(&q->mq_flush_lock);



	q->flush_rq = kzalloc(round_up(sizeof(struct request) +

				set->cmd_size, cache_line_size()),

				GFP_KERNEL);

	if (!q->flush_rq)

		return -ENOMEM;

	return 0;

}

block/blk-mq.c

+6 −10
Original line number Diff line number Diff line
@@ -1848,17 +1848,10 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set) 
	if (set->ops->complete)

		blk_queue_softirq_done(q, set->ops->complete);



	blk_mq_init_flush(q);

	blk_mq_init_cpu_queues(q, set->nr_hw_queues);



	q->flush_rq = kzalloc(round_up(sizeof(struct request) +

				set->cmd_size, cache_line_size()),

				GFP_KERNEL);

	if (!q->flush_rq)

		goto err_hw;



	if (blk_mq_init_hw_queues(q, set))

		goto err_flush_rq;

		goto err_hw;



	mutex_lock(&all_q_mutex);

	list_add_tail(&q->all_q_node, &all_q_list);
@@ -1866,12 +1859,15 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set) 


	blk_mq_add_queue_tag_set(set, q);



	if (blk_mq_init_flush(q))

		goto err_hw_queues;



	blk_mq_map_swqueue(q);



	return q;



err_flush_rq:

	kfree(q->flush_rq);

err_hw_queues:

	blk_mq_exit_hw_queues(q, set, set->nr_hw_queues);

err_hw:

	blk_cleanup_queue(q);

err_hctxs:

block/blk-mq.h

+1 −1
Original line number Diff line number Diff line
@@ -27,7 +27,7 @@ struct blk_mq_ctx { 


void __blk_mq_complete_request(struct request *rq);

void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);

void blk_mq_init_flush(struct request_queue *q);

int blk_mq_init_flush(struct request_queue *q);

void blk_mq_freeze_queue(struct request_queue *q);

void blk_mq_free_queue(struct request_queue *q);

void blk_mq_clone_flush_request(struct request *flush_rq,