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-rw-r--r--block/blk-merge.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 89b97b5..9476b15 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -385,6 +385,14 @@ static bool req_no_special_merge(struct request *req)
return !q->mq_ops && req->special;
}
+static int req_gap_to_prev(struct request *req, struct request *next)
+{
+ struct bio *prev = req->biotail;
+
+ return bvec_gap_to_prev(&prev->bi_io_vec[prev->bi_vcnt - 1],
+ next->bio->bi_io_vec[0].bv_offset);
+}
+
static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
struct request *next)
{
@@ -399,6 +407,10 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
if (req_no_special_merge(req) || req_no_special_merge(next))
return 0;
+ if (test_bit(QUEUE_FLAG_SG_GAPS, &q->queue_flags) &&
+ req_gap_to_prev(req, next))
+ return 0;
+
/*
* Will it become too large?
*/
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