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dm rq: replace 'bio->bi_vcnt == 1' with !bio_multiple_segments

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Avoid accessing .bi_vcnt directly, because the bio can be split from
block layer and .bi_vcnt should never have been used here.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Ming Lei 2016-11-11 20:05:36 +08:00 • committed by Mike Snitzer
commit 4f9c74c604
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-rq.c
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@ -825,7 +825,7 @@ static void dm_old_request_fn(struct request_queue *q)
pos = blk_rq_pos(rq);
if ((dm_old_request_peeked_before_merge_deadline(md) &&
md_in_flight(md) && rq->bio && rq->bio->bi_vcnt == 1 &&
md_in_flight(md) && rq->bio && !bio_multiple_segments(rq->bio) &&
md->last_rq_pos == pos && md->last_rq_rw == rq_data_dir(rq)) ||
(ti->type->busy && ti->type->busy(ti))) {
blk_delay_queue(q, 10);