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block: fix double account of flush request's driver tag

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In case of none scheduler, we share data request's driver tag for
flush request, so have to mark the flush request as INFLIGHT for
avoiding double account of this driver tag.

Fixes: 568f270065 ("blk-mq: centralise related handling into blk_mq_get_driver_tag")
Reported-by: Matthew Wilcox <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Tested-by: Matthew Wilcox <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ming Lei authored and Jens Axboe committed 2020-08-11 13:53:32 -06:00
1 parent fe6a8fc5ed
commit c1e2b8422b
1 file changed
+9 -2
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block/blk-flush.c
+9 -2
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@@ -308,9 +308,16 @@ static void blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq,
flush_rq->mq_ctx = first_rq->mq_ctx;
flush_rq->mq_hctx = first_rq->mq_hctx;
if (!q->elevator)
if (!q->elevator) {
flush_rq->tag = first_rq->tag;
else
/*
* We borrow data request's driver tag, so have to mark
* this flush request as INFLIGHT for avoiding double
* account of this driver tag
*/
flush_rq->rq_flags |= RQF_MQ_INFLIGHT;
} else
flush_rq->internal_tag = first_rq->internal_tag;
flush_rq->cmd_flags = REQ_OP_FLUSH | REQ_PREFLUSH;