Commit fd001443 authored by Bart Van Assche's avatar Bart Van Assche Committed by Jens Axboe
Browse files

blk-mq: Introduce blk_mq_queue_stopped()

The function blk_queue_stopped() allows to test whether or not a
traditional request queue has been stopped. Introduce a helper
function that allows block drivers to query easily whether or not
one or more hardware contexts of a blk-mq queue have been stopped.
Signed-off-by: default avatarBart Van Assche <>
Reviewed-by: default avatarHannes Reinecke <>
Reviewed-by: default avatarJohannes Thumshirn <>
Reviewed-by: default avatarSagi Grimberg <>
Reviewed-by: default avatarChristoph Hellwig <>
Signed-off-by: default avatarJens Axboe <>
parent 5d1b25c1
......@@ -944,6 +944,26 @@ void blk_mq_run_hw_queues(struct request_queue *q, bool async)
* blk_mq_queue_stopped() - check whether one or more hctxs have been stopped
* @q: request queue.
* The caller is responsible for serializing this function against
* blk_mq_{start,stop}_hw_queue().
bool blk_mq_queue_stopped(struct request_queue *q)
struct blk_mq_hw_ctx *hctx;
int i;
queue_for_each_hw_ctx(q, hctx, i)
if (blk_mq_hctx_stopped(hctx))
return true;
return false;
void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx)
......@@ -223,6 +223,7 @@ void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs
void blk_mq_abort_requeue_list(struct request_queue *q);
void blk_mq_complete_request(struct request *rq, int error);
bool blk_mq_queue_stopped(struct request_queue *q);
void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
void blk_mq_stop_hw_queues(struct request_queue *q);
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