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blk-mq: allocate flush_rq in blk_mq_init_flush()

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

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2014-09-25 23:23:39 +08:00 committed by Jens Axboe
parent 08e98fc601
commit 1bcb1eada4
3 changed files with 17 additions and 12 deletions
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11
block/blk-flush.c
View File

@ -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;
}

16
block/blk-mq.c
View File

@ -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:

2
block/blk-mq.h
View File

@ -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,