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block: add queue_is_mq() helper

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Various spots check for q->mq_ops being non-NULL, but provide
a helper to do this instead.

Where the ->mq_ops != NULL check is redundant, remove it.

Since mq == rq-based now that legacy is gone, get rid of the
queue_is_rq_based() and just use queue_is_mq() everywhere.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-11-15 12:22:51 -07:00
parent dabcefab45
commit 344e9ffcbd
14 changed files with 36 additions and 42 deletions
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6
include/linux/blkdev.h
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@ -656,11 +656,7 @@ static inline bool blk_account_rq(struct request *rq)
#define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
/*
* Driver can handle struct request, if it either has an old style
* request_fn defined, or is blk-mq based.
*/
static inline bool queue_is_rq_based(struct request_queue *q)
static inline bool queue_is_mq(struct request_queue *q)
{
return q->mq_ops;
}