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block: Introduce BLK_MQ_REQ_PREEMPT

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Set RQF_PREEMPT if BLK_MQ_REQ_PREEMPT is passed to
blk_get_request_flags().

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Martin Steigerwald <martin@lichtvoll.de>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche
2017-11-09 10:49:55 -08:00
committed by Jens Axboe
parent 6a15674d1e
commit 1b6d65a0bf
3 changed files with 6 additions and 1 deletions
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include/linux/blk-mq.h
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@@ -212,6 +212,7 @@ enum {
BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */
BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */
BLK_MQ_REQ_INTERNAL = (1 << 2), /* allocate internal/sched tag */
BLK_MQ_REQ_PREEMPT = (1 << 3), /* set RQF_PREEMPT */
};
struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op,