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block: get the 1st and last bvec via helpers

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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@vger.kernel.org
Reported-by: Sagi Grimberg <sagig@dev.mellanox.co.il>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2016-02-26 23:40:52 +08:00 committed by Jens Axboe
parent e0af29171a
commit 25e71a99f1
1 changed files with 9 additions and 4 deletions
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13
include/linux/blkdev.h
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@ -1394,11 +1394,16 @@ 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))
return false;
if (bio_has_data(prev) && queue_virt_boundary(q)) {
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);
}
return false;
}
static inline bool req_gap_back_merge(struct request *req, struct bio *bio)