blk-mq: add blk_mq_start_hw_queues
authorChristoph Hellwig <hch@lst.de>
Wed, 16 Apr 2014 07:44:56 +0000 (09:44 +0200)
committerJens Axboe <axboe@fb.com>
Wed, 16 Apr 2014 20:15:25 +0000 (14:15 -0600)
Add a helper to unconditionally kick contexts of a queue.  This will
be needed by the SCSI layer to provide fair queueing between multiple
devices on a single host.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
block/blk-mq.c
include/linux/blk-mq.h

index 0cf52dddfa6b59f280340988b9add3d852c52988..543bbc08a2614e8ee6f6eecb42fa096b9f0fe746 100644 (file)
@@ -701,6 +701,17 @@ void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx)
 }
 EXPORT_SYMBOL(blk_mq_start_hw_queue);
 
+void blk_mq_start_hw_queues(struct request_queue *q)
+{
+       struct blk_mq_hw_ctx *hctx;
+       int i;
+
+       queue_for_each_hw_ctx(q, hctx, i)
+               blk_mq_start_hw_queue(hctx);
+}
+EXPORT_SYMBOL(blk_mq_start_hw_queues);
+
+
 void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async)
 {
        struct blk_mq_hw_ctx *hctx;
index ae868e77bc2f47ec08214ea336cf6d2a9ee464ad..391377e533673d2ec89aa2f7f7cd34e37db60048 100644 (file)
@@ -158,6 +158,7 @@ void blk_mq_complete_request(struct request *rq);
 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);
+void blk_mq_start_hw_queues(struct request_queue *q);
 void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
 void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);