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Message-Id: <20190729190802.778876364@linuxfoundation.org>
Date: Mon, 29 Jul 2019 21:22:10 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Mikhail Skorzhinskii <mskorzhinskiy@...arflare.com>,
Sagi Grimberg <sagi@...mberg.me>,
Christoph Hellwig <hch@....de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.2 134/215] nvme-tcp: dont use sendpage for SLAB pages
[ Upstream commit 37c15219599f7a4baa73f6e3432afc69ba7cc530 ]
According to commit a10674bf2406 ("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@...arflare.com>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/nvme/host/tcp.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 08a2501b9357..606b13d35d16 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -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;
--
2.20.1
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