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authorMing Lei <ming.lei@redhat.com>2020-08-10 06:59:50 +0300
committerJens Axboe <axboe@kernel.dk>2020-08-11 22:53:32 +0300
commitc1e2b8422bf946c80e832cee22b3399634f87a2c (patch)
treeb2f0e952a1eb443f310044dd5c7962124d6ad1c7 /block
parentfe6a8fc5ed2f0081f17375ae2005718522c392c6 (diff)
downloadlinux-c1e2b8422bf946c80e832cee22b3399634f87a2c.tar.xz
block: fix double account of flush request's driver tag
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: 568f27006577 ("blk-mq: centralise related handling into blk_mq_get_driver_tag") Reported-by: Matthew Wilcox <willy@infradead.org> Signed-off-by: Ming Lei <ming.lei@redhat.com> Tested-by: Matthew Wilcox <willy@infradead.org> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-flush.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/block/blk-flush.c b/block/blk-flush.c
index 6e1543c10493..53abb5c73d99 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -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;