Since _drdb_sendpage() is now using sendmsg to send the pages rather sendpage, pass the entire bio in one go using a bvec iterator instead of doing it piecemeal. Signed-off-by: David Howells <dhowells@xxxxxxxxxx> cc: Philipp Reisner <philipp.reisner@xxxxxxxxxx> cc: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx> cc: "Christoph Böhmwalder" <christoph.boehmwalder@xxxxxxxxxx> cc: Jens Axboe <axboe@xxxxxxxxx> cc: "David S. Miller" <davem@xxxxxxxxxxxxx> cc: Eric Dumazet <edumazet@xxxxxxxxxx> cc: Jakub Kicinski <kuba@xxxxxxxxxx> cc: Paolo Abeni <pabeni@xxxxxxxxxx> cc: drbd-dev@xxxxxxxxxxxxxxxx cc: linux-block@xxxxxxxxxxxxxxx cc: netdev@xxxxxxxxxxxxxxx --- drivers/block/drbd/drbd_main.c | 77 +++++++++++----------------------- 1 file changed, 25 insertions(+), 52 deletions(-) diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index e5f90abd29b6..ab63d6138407 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -1512,28 +1512,15 @@ static void drbd_update_congested(struct drbd_connection *connection) * As a workaround, we disable sendpage on pages * with page_count == 0 or PageSlab. */ -static int _drbd_no_send_page(struct drbd_peer_device *peer_device, struct page *page, - int offset, size_t size, unsigned msg_flags) -{ - struct socket *socket; - void *addr; - int err; - - socket = peer_device->connection->data.socket; - addr = kmap(page) + offset; - err = drbd_send_all(peer_device->connection, socket, addr, size, msg_flags); - kunmap(page); - if (!err) - peer_device->device->send_cnt += size >> 9; - return err; -} - -static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *page, - int offset, size_t size, unsigned msg_flags) +static int _drbd_send_pages(struct drbd_peer_device *peer_device, + struct iov_iter *iter, unsigned msg_flags) { struct socket *socket = peer_device->connection->data.socket; - struct bio_vec bvec; - struct msghdr msg = { .msg_flags = msg_flags, }; + struct msghdr msg = { + .msg_flags = msg_flags | MSG_NOSIGNAL, + .msg_iter = *iter, + }; + size_t size = iov_iter_count(iter); int err = -EIO; /* e.g. XFS meta- & log-data is in slab pages, which have a @@ -1542,11 +1529,8 @@ static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *pa * put_page(); and would cause either a VM_BUG directly, or * __page_cache_release a page that would actually still be referenced * by someone, leading to some obscure delayed Oops somewhere else. */ - if (!drbd_disable_sendpage && sendpage_ok(page)) - msg.msg_flags |= MSG_NOSIGNAL | MSG_SPLICE_PAGES; - - bvec_set_page(&bvec, page, offset, size); - iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size); + if (drbd_disable_sendpage) + msg.msg_flags &= ~(MSG_NOSIGNAL | MSG_SPLICE_PAGES); drbd_update_congested(peer_device->connection); do { @@ -1577,39 +1561,22 @@ static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *pa static int _drbd_send_bio(struct drbd_peer_device *peer_device, struct bio *bio) { - struct bio_vec bvec; - struct bvec_iter iter; + struct iov_iter iter; - /* hint all but last page with MSG_MORE */ - bio_for_each_segment(bvec, bio, iter) { - int err; + iov_iter_bvec(&iter, ITER_SOURCE, bio->bi_io_vec, bio->bi_vcnt, + bio->bi_iter.bi_size); - err = _drbd_no_send_page(peer_device, bvec.bv_page, - bvec.bv_offset, bvec.bv_len, - bio_iter_last(bvec, iter) - ? 0 : MSG_MORE); - if (err) - return err; - } - return 0; + return _drbd_send_pages(peer_device, &iter, 0); } static int _drbd_send_zc_bio(struct drbd_peer_device *peer_device, struct bio *bio) { - struct bio_vec bvec; - struct bvec_iter iter; + struct iov_iter iter; - /* hint all but last page with MSG_MORE */ - bio_for_each_segment(bvec, bio, iter) { - int err; + iov_iter_bvec(&iter, ITER_SOURCE, bio->bi_io_vec, bio->bi_vcnt, + bio->bi_iter.bi_size); - err = _drbd_send_page(peer_device, bvec.bv_page, - bvec.bv_offset, bvec.bv_len, - bio_iter_last(bvec, iter) ? 0 : MSG_MORE); - if (err) - return err; - } - return 0; + return _drbd_send_pages(peer_device, &iter, MSG_SPLICE_PAGES); } static int _drbd_send_zc_ee(struct drbd_peer_device *peer_device, @@ -1621,10 +1588,16 @@ static int _drbd_send_zc_ee(struct drbd_peer_device *peer_device, /* hint all but last page with MSG_MORE */ page_chain_for_each(page) { + struct iov_iter iter; + struct bio_vec bvec; unsigned l = min_t(unsigned, len, PAGE_SIZE); - err = _drbd_send_page(peer_device, page, 0, l, - page_chain_next(page) ? MSG_MORE : 0); + bvec_set_page(&bvec, page, 0, l); + iov_iter_bvec(&iter, ITER_SOURCE, &bvec, 1, l); + + err = _drbd_send_pages(peer_device, &iter, + MSG_SPLICE_PAGES | + (page_chain_next(page) ? MSG_MORE : 0)); if (err) return err; len -= l;