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| author |   Jens Axboe <axboe@kernel.dk> | 2018-11-08 09:03:51 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-11-08 10:24:23 -0700 |
| commit | ae8799125d565c798e49dcab4bf182dbfc483524 (patch) | |
| tree | 9cf36f53aad46a716d8b7476da384823d82e9e38 /include/linux/blk-mq.h | |
| parent | blk-mq-tag: change busy_iter_fn to return whether to continue or not (diff) | |
| download | wireguard-linux-ae8799125d565c798e49dcab4bf182dbfc483524.tar.xz wireguard-linux-ae8799125d565c798e49dcab4bf182dbfc483524.zip | |
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.h | 2 |
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), |