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

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According to commit a10674bf24 ("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>
This commit is contained in:
Mikhail Skorzhinskii 2019-07-08 12:31:29 +02:00 committed by Christoph Hellwig
parent 958f2a0f81
commit 37c1521959
1 changed files with 8 additions and 1 deletions
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9
drivers/nvme/host/tcp.c
View file

@ -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;