Commit 764f612c authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe

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: default avatarMing Lei <>
Tested-by: default avatarJeff Mahoney <>
Signed-off-by: default avatarJens Axboe <>
parent b8839b8c
......@@ -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,
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,
bio->bi_next = nxt;
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