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-rw-r--r--block/blk-mq.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index ac8a0413664e..c9e89a8792e3 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1068,13 +1068,17 @@ static void blk_mq_bio_to_request(struct request *rq, struct bio *bio)
blk_account_io_start(rq, 1);
}
+static inline bool hctx_allow_merges(struct blk_mq_hw_ctx *hctx)
+{
+ return (hctx->flags & BLK_MQ_F_SHOULD_MERGE) &&
+ !blk_queue_nomerges(hctx->queue);
+}
+
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)
{
- struct request_queue *q = hctx->queue;
-
- if (!(hctx->flags & BLK_MQ_F_SHOULD_MERGE)) {
+ if (!hctx_allow_merges(hctx)) {
blk_mq_bio_to_request(rq, bio);
spin_lock(&ctx->lock);
insert_rq:
@@ -1082,6 +1086,8 @@ insert_rq:
spin_unlock(&ctx->lock);
return false;
} else {
+ struct request_queue *q = hctx->queue;
+
spin_lock(&ctx->lock);
if (!blk_mq_attempt_merge(q, ctx, bio)) {
blk_mq_bio_to_request(rq, bio);