nvme-tcp: pass multipage bvec to request iov_iter
iov_iter uses the right helpers so we should be able
to pass in a multipage bvec. Right now the iov_iter is
initialized with more segments that it needs which doesn't
fail because the iov_iter is capped by byte count, but it
is better to use a full multipage bvec iter.
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index f2f3471..4c13c71 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -224,24 +224,29 @@ static void nvme_tcp_init_iter(struct nvme_tcp_request *req,
struct request *rq = blk_mq_rq_from_pdu(req);
struct bio_vec *vec;
unsigned int size;
- int nsegs;
+ int nr_bvec;
size_t offset;
if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) {
vec = &rq->special_vec;
- nsegs = 1;
+ nr_bvec = 1;
size = blk_rq_payload_bytes(rq);
offset = 0;
} else {
struct bio *bio = req->curr_bio;
+ struct bvec_iter bi;
+ struct bio_vec bv;
vec = __bvec_iter_bvec(bio->bi_io_vec, bio->bi_iter);
- nsegs = bio_segments(bio);
+ nr_bvec = 0;
+ bio_for_each_bvec(bv, bio, bi) {
+ nr_bvec++;
+ }
size = bio->bi_iter.bi_size;
offset = bio->bi_iter.bi_bvec_done;
}
- iov_iter_bvec(&req->iter, dir, vec, nsegs, size);
+ iov_iter_bvec(&req->iter, dir, vec, nr_bvec, size);
req->iter.iov_offset = offset;
}
