+static inline struct tty_struct *file_tty(struct file *file)
+{
+ return ((struct tty_file_private *)file->private_data)->tty;
+}
+
+/* Associate a new file with the tty structure */
+void tty_add_file(struct tty_struct *tty, struct file *file)
+{
+ struct tty_file_private *priv;
+
+ /* XXX: must implement proper error handling in callers */
+ priv = kmalloc(sizeof(*priv), GFP_KERNEL|__GFP_NOFAIL);
+
+ priv->tty = tty;
+ priv->file = file;
+ file->private_data = priv;
+
+ spin_lock(&tty_files_lock);
+ list_add(&priv->list, &tty->tty_files);
+ spin_unlock(&tty_files_lock);
+}
+
+/* Delete file from its tty */
+void tty_del_file(struct file *file)
+{
+ struct tty_file_private *priv = file->private_data;
+
+ spin_lock(&tty_files_lock);
+ list_del(&priv->list);
+ spin_unlock(&tty_files_lock);
+ file->private_data = NULL;
+ kfree(priv);
+}
+
+