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authorJens Axboe <axboe@kernel.dk>2018-11-08 19:03:51 +0300
committerJens Axboe <axboe@kernel.dk>2018-11-08 20:24:23 +0300
commitae8799125d565c798e49dcab4bf182dbfc483524 (patch)
tree9cf36f53aad46a716d8b7476da384823d82e9e38 /include/linux/blk-mq.h
parent7baa85727d0406ffd2b2303cd803a145aa35c505 (diff)
downloadlinux-ae8799125d565c798e49dcab4bf182dbfc483524.tar.xz
blk-mq: provide a helper to check if a queue is busy
Returns true if the queue currently has requests pending, false if not. DM can use this to replace the atomic_inc/dec they do per device to see if a device is busy. Reviewed-by: Mike Snitzer <snitzer@redhat.com> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blk-mq.h')
-rw-r--r--include/linux/blk-mq.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index ff497dfcbbf9..929e8abc5535 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -250,6 +250,8 @@ void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
void blk_mq_free_request(struct request *rq);
bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
+bool blk_mq_queue_busy(struct request_queue *q);
+
enum {
/* return when out of requests */
BLK_MQ_REQ_NOWAIT = (__force blk_mq_req_flags_t)(1 << 0),