[Bluetooth] Add support for TIOCOUTQ and TIOCINQ ioctls

Almost every protocol family supports the TIOCOUTQ and TIOCINQ ioctls
and even Bluetooth could make use of them. When implementing audio
streaming and integration with GStreamer or PulseAudio they will allow
a better timing and synchronization.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index 88afe25..77fe9b8 100644 (file)
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -335,11 +335,34 @@ EXPORT_SYMBOL(bt_sock_poll);
 int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 {
        struct sock *sk = sock->sk;
 int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 {
        struct sock *sk = sock->sk;

+       struct sk_buff *skb;
+       long amount;

        int err;
 
        BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
 
        switch (cmd) {
        int err;
 
        BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
 
        switch (cmd) {

+       case TIOCOUTQ:
+               if (sk->sk_state == BT_LISTEN)
+                       return -EINVAL;
+
+               amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
+               if (amount < 0)
+                       amount = 0;
+               err = put_user(amount, (int __user *) arg);
+               break;
+
+       case TIOCINQ:
+               if (sk->sk_state == BT_LISTEN)
+                       return -EINVAL;
+
+               lock_sock(sk);
+               skb = skb_peek(&sk->sk_receive_queue);
+               amount = skb ? skb->len : 0;
+               release_sock(sk);
+               err = put_user(amount, (int __user *) arg);
+               break;
+

        case SIOCGSTAMP:
                err = sock_get_timestamp(sk, (struct timeval __user *) arg);
                break;
        case SIOCGSTAMP:
                err = sock_get_timestamp(sk, (struct timeval __user *) arg);
                break;