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Groups > linux.kernel > #1246287

[PATCH 2/4] block: avoid to merge splitted bio

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The splitted bio has been already too fat to merge, so mark it
as NOMERGE.

Signed-off-by: Ming Lei <ming.lei@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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Thread

[PATCH 0/4] block: some misc changes Ming Lei <ming.lei@canonical.com> - 2015-10-14 05:40 +0200
  [PATCH 1/4] block: setup bi_phys_segments after splitting Ming Lei <ming.lei@canonical.com> - 2015-10-14 05:40 +0200
    Re: [PATCH 1/4] block: setup bi_phys_segments after splitting Jeff Moyer <jmoyer@redhat.com> - 2015-10-15 17:20 +0200
  [PATCH 3/4] blk-mq: check bio_mergeable() early before merging Ming Lei <ming.lei@canonical.com> - 2015-10-14 05:40 +0200
    Re: [PATCH 3/4] blk-mq: check bio_mergeable() early before merging Jeff Moyer <jmoyer@redhat.com> - 2015-10-15 17:30 +0200
      Re: [PATCH 3/4] blk-mq: check bio_mergeable() early before merging Ming Lei <ming.lei@canonical.com> - 2015-10-16 02:30 +0200
  [PATCH 4/4] blk-mq: mark ctx as pending at batch in flush plug path Ming Lei <ming.lei@canonical.com> - 2015-10-14 05:40 +0200
    Re: [PATCH 4/4] blk-mq: mark ctx as pending at batch in flush plug path Jeff Moyer <jmoyer@redhat.com> - 2015-10-15 17:30 +0200
      Re: [PATCH 4/4] blk-mq: mark ctx as pending at batch in flush plug path Ming Lei <ming.lei@canonical.com> - 2015-10-16 02:30 +0200
  [PATCH 2/4] block: avoid to merge splitted bio Ming Lei <ming.lei@canonical.com> - 2015-10-14 05:40 +0200
    Re: [PATCH 2/4] block: avoid to merge splitted bio Jeff Moyer <jmoyer@redhat.com> - 2015-10-15 17:20 +0200

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