[NET]: Use file->private_data to get socket pointer.

Avoid touching file->f_dentry on sockets, since file->private_data
directly gives us the socket pointer.

Signed-off-by: Eric Dumazet <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/packet/af_packet.c

···
 static void packet_mm_open(struct vm_area_struct *vma)
 {
 	struct file *file = vma->vm_file;
-	struct inode *inode = file->f_dentry->d_inode;
-	struct socket * sock = SOCKET_I(inode);
+	struct socket * sock = file->private_data;
 	struct sock *sk = sock->sk;
 	
 	if (sk)
···
 static void packet_mm_close(struct vm_area_struct *vma)
 {
 	struct file *file = vma->vm_file;
-	struct inode *inode = file->f_dentry->d_inode;
-	struct socket * sock = SOCKET_I(inode);
+	struct socket * sock = file->private_data;
 	struct sock *sk = sock->sk;
 	
 	if (sk)

net/socket.c

···
 	}
 	iocb->private = x;
 	x->kiocb = iocb;
-	sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode); 
+	sock = iocb->ki_filp->private_data; 
 
 	x->async_msg.msg_name = NULL;
 	x->async_msg.msg_namelen = 0;
···
 	}
 	iocb->private = x;
 	x->kiocb = iocb;
-	sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode); 
+	sock = iocb->ki_filp->private_data; 
 
 	x->async_msg.msg_name = NULL;
 	x->async_msg.msg_namelen = 0;
···
 	struct socket *sock;
 	int flags;
 
-	sock = SOCKET_I(file->f_dentry->d_inode);
+	sock = file->private_data;
 
 	flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
 	if (more)
···
 	return sock->ops->sendpage(sock, page, offset, size, flags);
 }
 
-static int sock_readv_writev(int type, struct inode * inode,
+static int sock_readv_writev(int type,
 			     struct file * file, const struct iovec * iov,
 			     long count, size_t size)
 {
 	struct msghdr msg;
 	struct socket *sock;
 
-	sock = SOCKET_I(inode);
+	sock = file->private_data;
 
 	msg.msg_name = NULL;
 	msg.msg_namelen = 0;
···
 	int i;
         for (i = 0 ; i < count ; i++)
                 tot_len += vector[i].iov_len;
-	return sock_readv_writev(VERIFY_WRITE, file->f_dentry->d_inode,
+	return sock_readv_writev(VERIFY_WRITE,
 				 file, vector, count, tot_len);
 }
 	
···
 	int i;
         for (i = 0 ; i < count ; i++)
                 tot_len += vector[i].iov_len;
-	return sock_readv_writev(VERIFY_READ, file->f_dentry->d_inode,
+	return sock_readv_writev(VERIFY_READ,
 				 file, vector, count, tot_len);
 }
 
···
 	void __user *argp = (void __user *)arg;
 	int pid, err;
 
-	sock = SOCKET_I(file->f_dentry->d_inode);
+	sock = file->private_data;
 	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
 		err = dev_ioctl(cmd, argp);
 	} else
···
 	/*
 	 *	We can't return errors to poll, so it's either yes or no. 
 	 */
-	sock = SOCKET_I(file->f_dentry->d_inode);
+	sock = file->private_data;
 	return sock->ops->poll(file, sock, wait);
 }
 
 static int sock_mmap(struct file * file, struct vm_area_struct * vma)
 {
-	struct socket *sock = SOCKET_I(file->f_dentry->d_inode);
+	struct socket *sock = file->private_data;
 
 	return sock->ops->mmap(file, sock, vma);
 }
···
 			return -ENOMEM;
 	}
 
-	sock = SOCKET_I(filp->f_dentry->d_inode);
+	sock = filp->private_data;
 
 	if ((sk=sock->sk) == NULL) {
 		kfree(fna);