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-rw-r--r--block/blk-merge.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 5f244825379..1ffc5897783 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -308,6 +308,17 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
return ll_new_hw_segment(q, req, bio);
}
+/*
+ * blk-mq uses req->special to carry normal driver per-request payload, it
+ * does not indicate a prepared command that we cannot merge with.
+ */
+static bool req_no_special_merge(struct request *req)
+{
+ struct request_queue *q = req->q;
+
+ return !q->mq_ops && req->special;
+}
+
static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
struct request *next)
{
@@ -319,7 +330,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
* First check if the either of the requests are re-queued
* requests. Can't merge them if they are.
*/
- if (req->special || next->special)
+ if (req_no_special_merge(req) || req_no_special_merge(next))
return 0;
/*
@@ -416,7 +427,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
if (rq_data_dir(req) != rq_data_dir(next)
|| req->rq_disk != next->rq_disk
- || next->special)
+ || req_no_special_merge(next))
return 0;
if (req->cmd_flags & REQ_WRITE_SAME &&
@@ -515,7 +526,7 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
return false;
/* must be same device and not a special request */
- if (rq->rq_disk != bio->bi_bdev->bd_disk || rq->special)
+ if (rq->rq_disk != bio->bi_bdev->bd_disk || req_no_special_merge(rq))
return false;
/* only merge integrity protected bio into ditto rq */