netdev - [PATCH v4 3/4] drbd: use sendpages_ok() instead of sendpage

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Date: Tue, 11 Jun 2024 09:36:16 +0300
From: Ofir Gal <ofir.gal@...umez.com>
To: davem@...emloft.net,
	linux-block@...r.kernel.org,
	linux-nvme@...ts.infradead.org,
	netdev@...r.kernel.org,
	ceph-devel@...r.kernel.org
Cc: dhowells@...hat.com,
	edumazet@...gle.com,
	pabeni@...hat.com,
	philipp.reisner@...bit.com,
	lars.ellenberg@...bit.com,
	christoph.boehmwalder@...bit.com
Subject: [PATCH v4 3/4] drbd: use sendpages_ok() instead of sendpage_ok()

Currently _drbd_send_page() use sendpage_ok() in order to enable
MSG_SPLICE_PAGES, it check the first page of the iterator, the iterator
may represent contiguous pages.

MSG_SPLICE_PAGES enables skb_splice_from_iter() which checks all the
pages it sends with sendpage_ok().

When _drbd_send_page() sends an iterator that the first page is
sendable, but one of the other pages isn't skb_splice_from_iter() warns
and aborts the data transfer.

Using the new helper sendpages_ok() in order to enable MSG_SPLICE_PAGES
solves the issue.

Acked-by: Christoph Böhmwalder <christoph.boehmwalder@...bit.com>
Signed-off-by: Ofir Gal <ofir.gal@...umez.com>
---
 drivers/block/drbd/drbd_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 113b441d4d36..a5dbbf6cce23 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1550,7 +1550,7 @@ 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))
+	if (!drbd_disable_sendpage && sendpages_ok(page, len, offset))
 		msg.msg_flags |= MSG_NOSIGNAL | MSG_SPLICE_PAGES;
 
 	drbd_update_congested(peer_device->connection);
-- 
2.45.1