This needs the patch below for the blk-mq case with multiple queues.
Also I wonder why we really want to push this below ->make_request.
Moving it just outside ->make_request would make the callchain more
obvious and avoid the recursion into the driver.
diff --git a/block/blk-mq.c b/block/blk-mq.c
index e9bbc04..e7fae76 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1256,6 +1256,8 @@ static void blk_mq_make_request(struct request_queue *q,
struct bio *bio)
return;
}
+ blk_queue_split(q, &bio, q->bio_split);
+
rq = blk_mq_map_request(q, bio, &data);
if (unlikely(!rq))
return;
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