Messages in this thread | | | From | Ming Lei <> | Date | Tue, 15 Nov 2016 09:03:14 +0800 | Subject | Re: [PATCH 08/12] dm: dm.c: replace 'bio->bi_vcnt == 1' with !bio_multiple_segments |
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On Fri, Nov 11, 2016 at 8:05 PM, Ming Lei <tom.leiming@gmail.com> wrote: > Avoid to access .bi_vcnt directly, because the bio can be > splitted from block layer, and .bi_vcnt should never have > been used here. > > Signed-off-by: Ming Lei <tom.leiming@gmail.com> > --- > drivers/md/dm-rq.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c > index b2a9e2d161e4..d9cc8324e597 100644 > --- a/drivers/md/dm-rq.c > +++ b/drivers/md/dm-rq.c > @@ -797,8 +797,13 @@ static void dm_old_request_fn(struct request_queue *q) > if (req_op(rq) != REQ_OP_FLUSH) > pos = blk_rq_pos(rq); > > + /* > + * bio can be splitted from block layer, so use > + * !bio_multiple_segments instead of 'bio->bi_vcnt == 1' > + */ > 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);
Hi Alasdair, Mike, Christoph and anyone,
Could you give this one a review?
Thanks, Ming Lei
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