It isn't necessary to try to merge the bio which is marked
as NOMERGE.
Signed-off-by: Ming Lei <ming....@canonical.com>
---
block/blk-mq.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 546b3b8..deb5f4c 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -671,6 +671,9 @@ static bool blk_mq_attempt_merge(struct request_queue *q,
struct request *rq;
int checked = 8;
+ if (!bio_mergeable(bio))
+ return false;
+
list_for_each_entry_reverse(rq, &ctx->rq_list, queuelist) {
int el_ret;
@@ -1140,7 +1143,7 @@ static inline bool blk_mq_merge_queue_io(struct
blk_mq_hw_ctx *hctx,
struct blk_mq_ctx *ctx,
struct request *rq, struct bio *bio)
{
- if (!hctx_allow_merges(hctx)) {
+ if (!hctx_allow_merges(hctx) || !bio_mergeable(bio)) {
blk_mq_bio_to_request(rq, bio);
spin_lock(&ctx->lock);
insert_rq:
--
1.9.1
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