io_uring/net: fail zc sendmsg when unsupported by socket

The previous patch fails zerocopy send requests for protocols that don't
support it, do the same for zerocopy sendmsg.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0854e7bb4c3d810a48ec8b5853e2f61af36a0467.1666346426.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/io_uring/net.c b/io_uring/net.c
index 26ff3675214db58a812fab9b9c70dd68d408aa66..15dea91625e21d58d902d3be7c2a1dc188e30cc2 100644 (file)
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -1153,6 +1153,8 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
        sock = sock_from_file(req->file);
        if (unlikely(!sock))
                return -ENOTSOCK;
+       if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags))
+               return -EOPNOTSUPP;
 
        if (req_has_async_data(req)) {
                kmsg = req->async_data;