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blk-merge: don't compute bi_phys_segments from bi_vcnt for cloned bio 

It isn't correct to figure out req->bi_phys_segments from bio->bi_vcnt
if the bio is cloned.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Tested-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2014-10-09 23:17:35 +08:00 committed by Jens Axboe
parent b8839b8c55
commit 764f612c6c
1 changed files with 6 additions and 2 deletions
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8
block/blk-merge.c
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@ -97,14 +97,18 @@ void blk_recalc_rq_segments(struct request *rq)
void blk_recount_segments(struct request_queue *q, struct bio *bio)
{
if (test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags) &&
bool no_sg_merge = !!test_bit(QUEUE_FLAG_NO_SG_MERGE,
&q->queue_flags);
if (no_sg_merge && !bio_flagged(bio, BIO_CLONED) &&
bio->bi_vcnt < queue_max_segments(q))
bio->bi_phys_segments = bio->bi_vcnt;
else {
struct bio *nxt = bio->bi_next;
bio->bi_next = NULL;
bio->bi_phys_segments = __blk_recalc_rq_segments(q, bio, false);
bio->bi_phys_segments = __blk_recalc_rq_segments(q, bio,
no_sg_merge);
bio->bi_next = nxt;
}