Commit 37c15219 authored Jul 08, 2019 by Mikhail Skorzhinskii Committed by Christoph Hellwig Jul 09, 2019

nvme-tcp: don't use sendpage for SLAB pages



According to commit a10674bf ("tcp: detecting the misuse of
.sendpage for Slab objects") and previous discussion, tcp_sendpage
should not be used for pages that is managed by SLAB, as SLAB is not
taking page reference counters into consideration.

Signed-off-by: Mikhail Skorzhinskii <mskorzhinskiy@solarflare.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

parent 958f2a0f

drivers/nvme/host/tcp.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -860,7 +860,14 @@ static int nvme_tcp_try_send_data(struct nvme_tcp_request *req)
		else
		flags \|= MSG_MORE;

		ret = kernel_sendpage(queue->sock, page, offset, len, flags);
		/* can't zcopy slab pages */
		if (unlikely(PageSlab(page))) {
		ret = sock_no_sendpage(queue->sock, page, offset, len,
		flags);
		} else {
		ret = kernel_sendpage(queue->sock, page, offset, len,
		flags);
		}
		if (ret <= 0)
		return ret;