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af_vsock: separate wait data loop

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Wait loop for data could be shared between SEQPACKET and STREAM
sockets, so move it to dedicated function. While moving the code
around, let's update an old comment.

Signed-off-by: Arseny Krasnov <arseny.krasnov@kaspersky.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arseny Krasnov 2021-06-11 14:10:07 +03:00 committed by David S. Miller
parent a9e29e5511
commit b3f7fd5488
1 changed files with 87 additions and 75 deletions
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162
net/vmw_vsock/af_vsock.c
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@ -1833,6 +1833,69 @@ out:
return err;
}
static int vsock_wait_data(struct sock *sk, struct wait_queue_entry *wait,
long timeout,
struct vsock_transport_recv_notify_data *recv_data,
size_t target)
{
const struct vsock_transport *transport;
struct vsock_sock *vsk;
s64 data;
int err;
vsk = vsock_sk(sk);
err = 0;
transport = vsk->transport;
while ((data = vsock_stream_has_data(vsk)) == 0) {
prepare_to_wait(sk_sleep(sk), wait, TASK_INTERRUPTIBLE);
if (sk->sk_err != 0 ||
(sk->sk_shutdown & RCV_SHUTDOWN) ||
(vsk->peer_shutdown & SEND_SHUTDOWN)) {
break;
}
/* Don't wait for non-blocking sockets. */
if (timeout == 0) {
err = -EAGAIN;
break;
}
if (recv_data) {
err = transport->notify_recv_pre_block(vsk, target, recv_data);
if (err < 0)
break;
}
release_sock(sk);
timeout = schedule_timeout(timeout);
lock_sock(sk);
if (signal_pending(current)) {
err = sock_intr_errno(timeout);
break;
} else if (timeout == 0) {
err = -EAGAIN;
break;
}
}
finish_wait(sk_sleep(sk), wait);
if (err)
return err;
/* Internal transport error when checking for available
* data. XXX This should be changed to a connection
* reset in a later change.
*/
if (data < 0)
return -ENOMEM;
return data;
}
static int
vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
int flags)
@ -1912,85 +1975,34 @@ vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
while (1) {
s64 ready;
ssize_t read;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
ready = vsock_stream_has_data(vsk);
err = vsock_wait_data(sk, &wait, timeout, &recv_data, target);
if (err <= 0)
break;
if (ready == 0) {
if (sk->sk_err != 0 ||
(sk->sk_shutdown & RCV_SHUTDOWN) ||
(vsk->peer_shutdown & SEND_SHUTDOWN)) {
finish_wait(sk_sleep(sk), &wait);
break;
}
/* Don't wait for non-blocking sockets. */
if (timeout == 0) {
err = -EAGAIN;
finish_wait(sk_sleep(sk), &wait);
break;
}
err = transport->notify_recv_pre_dequeue(vsk, target,
&recv_data);
if (err < 0)
break;
err = transport->notify_recv_pre_block(
vsk, target, &recv_data);
if (err < 0) {
finish_wait(sk_sleep(sk), &wait);
break;
}
release_sock(sk);
timeout = schedule_timeout(timeout);
lock_sock(sk);
if (signal_pending(current)) {
err = sock_intr_errno(timeout);
finish_wait(sk_sleep(sk), &wait);
break;
} else if (timeout == 0) {
err = -EAGAIN;
finish_wait(sk_sleep(sk), &wait);
break;
}
} else {
ssize_t read;
finish_wait(sk_sleep(sk), &wait);
if (ready < 0) {
/* Invalid queue pair content. XXX This should
* be changed to a connection reset in a later
* change.
*/
err = -ENOMEM;
goto out;
}
err = transport->notify_recv_pre_dequeue(
vsk, target, &recv_data);
if (err < 0)
break;
read = transport->stream_dequeue(
vsk, msg,
len - copied, flags);
if (read < 0) {
err = -ENOMEM;
break;
}
copied += read;
err = transport->notify_recv_post_dequeue(
vsk, target, read,
!(flags & MSG_PEEK), &recv_data);
if (err < 0)
goto out;
if (read >= target || flags & MSG_PEEK)
break;
target -= read;
read = transport->stream_dequeue(vsk, msg, len - copied, flags);
if (read < 0) {
err = -ENOMEM;
break;
}
copied += read;
err = transport->notify_recv_post_dequeue(vsk, target, read,
!(flags & MSG_PEEK), &recv_data);
if (err < 0)
goto out;
if (read >= target || flags & MSG_PEEK)
break;
target -= read;
}
if (sk->sk_err)