From 6ac45aeb6bcad38a2783a7d6e5da4c469497eeb0 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 20 Oct 2015 23:13:53 +0800 Subject: [PATCH] block: avoid to merge splitted bio The splitted bio has been already too fat to merge, so mark it as NOMERGE. Reviewed-by: Jeff Moyer Signed-off-by: Ming Lei Signed-off-by: Jens Axboe --- block/blk-merge.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/blk-merge.c b/block/blk-merge.c index 22293fdf6514..de5716d8e525 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; -- 2.20.1