Issue a kernel warning if reordering could happen.
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
block/blk-mq.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 2cf317d49f56..07426dbbe720 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2480,6 +2480,8 @@ void blk_mq_request_bypass_insert(struct request *rq, bool at_head,
{
struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
+ WARN_ON_ONCE(rq->q->elevator && blk_rq_is_seq_zoned_write(rq));
+
spin_lock(&hctx->lock);
if (at_head)
list_add(&rq->queuelist, &hctx->dispatch);
@@ -2572,6 +2574,8 @@ static blk_status_t __blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx,
bool run_queue = true;
int budget_token;
+ WARN_ON_ONCE(q->elevator && blk_rq_is_seq_zoned_write(rq));
+
/*
* RCU or SRCU read lock is needed before checking quiesced flag.
*
