From f299b7c7a9dee64425e5965bd4f56dc024c1befc Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Tue, 8 Aug 2017 17:51:45 -0600
Subject: blk-mq: provide internal in-flight variant

We don't have to inc/dec some counter, since we can just
iterate the tags. That makes inc/dec a noop, but means we
have to iterate busy tags to get an in-flight count.

Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 block/blk-mq.h | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'block/blk-mq.h')

diff --git a/block/blk-mq.h b/block/blk-mq.h
index 60b01c0309bc..98252b79b80b 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -133,4 +133,7 @@ static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
 	return hctx->nr_ctx && hctx->tags;
 }
 
+void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part,
+			unsigned int inflight[2]);
+
 #endif
-- 
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