io_uring/net: account memory for zc sendmsg

Account pinned pages for IORING_OP_SENDMSG_ZC, just as we for
IORING_OP_SEND_ZC and net/ does for MSG_ZEROCOPY.

Fixes: 493108d ("io_uring/net: zerocopy sendmsg")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4f00f67ca6ac8e8ed62343ae92b5816b1e0c9c4b.1743086313.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/net.c

@@ -1303,6 +1303,7 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
 	struct io_ring_ctx *ctx = req->ctx;
 	struct io_kiocb *notif;
+	int ret;
 
 	zc->done_io = 0;
 	zc->retry = false;
@@ -1355,7 +1356,16 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 		req->flags |= REQ_F_IMPORT_BUFFER;
 		return io_send_setup(req, sqe);
 	}
-	return io_sendmsg_zc_setup(req, sqe);
+	ret = io_sendmsg_zc_setup(req, sqe);
+	if (unlikely(ret))
+		return ret;
+
+	if (!(zc->flags & IORING_RECVSEND_FIXED_BUF)) {
+		struct io_async_msghdr *iomsg = req->async_data;
+
+		return io_notif_account_mem(zc->notif, iomsg->msg.msg_iter.count);
+	}
+	return 0;
 }
 
 static int io_sg_from_iter_iovec(struct sk_buff *skb,