This patch applies the two introduced helpers to figure out the 1st and last bvec, and fixes the original way after bio splitting. Cc: stable@xxxxxxxxxxxxxxx # v4.3+ Reported-by: Sagi Grimberg <sagig@xxxxxxxxxxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxxxxx> --- include/linux/blkdev.h | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index b8ff6a3..7152102 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1388,11 +1388,16 @@ static inline bool bvec_gap_to_prev(struct request_queue *q, static inline bool bio_will_gap(struct request_queue *q, struct bio *prev, struct bio *next) { - if (!bio_has_data(prev) || !queue_virt_boundary(q)) + if (!bio_has_data(prev) || !queue_virt_boundary(q)) { return false; + } else { + struct bio_vec pb, nb; - return bvec_gap_to_prev(q, &prev->bi_io_vec[prev->bi_vcnt - 1], - next->bi_io_vec[0].bv_offset); + bio_get_last_bvec(prev, &pb); + bio_get_first_bvec(next, &nb); + + return bvec_gap_to_prev(q, &pb, nb.bv_offset); + } } static inline bool req_gap_back_merge(struct request *req, struct bio *bio) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html