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-rw-r--r--block/blk-mq.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4a622c832b31..4880e13e2394 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -790,6 +790,32 @@ struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag)
}
EXPORT_SYMBOL(blk_mq_tag_to_rq);
+static bool blk_mq_check_busy(struct blk_mq_hw_ctx *hctx, struct request *rq,
+ void *priv, bool reserved)
+{
+ /*
+ * If we find a request, we know the queue is busy. Return false
+ * to stop the iteration.
+ */
+ if (rq->q == hctx->queue) {
+ bool *busy = priv;
+
+ *busy = true;
+ return false;
+ }
+
+ return true;
+}
+
+bool blk_mq_queue_busy(struct request_queue *q)
+{
+ bool busy = false;
+
+ blk_mq_queue_tag_busy_iter(q, blk_mq_check_busy, &busy);
+ return busy;
+}
+EXPORT_SYMBOL_GPL(blk_mq_queue_busy);
+
static void blk_mq_rq_timed_out(struct request *req, bool reserved)
{
req->rq_flags |= RQF_TIMED_OUT;