The splitted bio has been already too fat to merge, so mark it
as NOMERGE.
Reviewed-by: Jeff Moyer <jmo...@redhat.com>
Signed-off-by: Ming Lei <ming....@canonical.com>
---
block/blk-merge.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 22293fd..de5716d8 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -139,6 +139,9 @@ void blk_queue_split(struct request_queue *q, struct bio
**bio,
bio_set_flag(res, BIO_SEG_VALID);
if (split) {
+ /* there isn't chance to merge the splitted bio */
+ split->bi_rw |= REQ_NOMERGE;
+
bio_chain(split, *bio);
generic_make_request(*bio);
*bio = split;
--
1.9.1
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