Commit 7c98a426 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'ceph-for-4.20-rc4' of https://github.com/ceph/ceph-client 

Pullk ceph fix from Ilya Dryomov:
 "A messenger fix, marked for stable"

* tag 'ceph-for-4.20-rc4' of https://github.com/ceph/ceph-client:
  libceph: fall back to sendmsg for slab pages
parents 3381918f 7e241f64

net/ceph/messenger.c

+9 −3
Original line number Diff line number Diff line
@@ -580,9 +580,15 @@ static int ceph_tcp_sendpage(struct socket *sock, struct page *page, 
	struct bio_vec bvec;

	int ret;



	/* sendpage cannot properly handle pages with page_count == 0,

	 * we need to fallback to sendmsg if that's the case */

	if (page_count(page) >= 1)

	/*

	 * sendpage cannot properly handle pages with page_count == 0,

	 * we need to fall back to sendmsg if that's the case.

	 *

	 * Same goes for slab pages: skb_can_coalesce() allows

	 * coalescing neighboring slab objects into a single frag which

	 * triggers one of hardened usercopy checks.

	 */

	if (page_count(page) >= 1 && !PageSlab(page))

		return __ceph_tcp_sendpage(sock, page, offset, size, more);



	bvec.bv_page = page;