tty: More driver operations

We have the lookup operation abstracted which is nice for pty cleanup but
we really want to abstract the add/remove entries as well so that we can
pull the pty code out of the tty core and create a clear defined interface
for the tty driver table.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index ba891dd23550..005d06ad46a6 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -15,6 +15,20 @@
  *
  *      Optional method. Default behaviour is to use the ttys array
  *
+ * int (*install)(struct tty_driver *self, struct tty_struct *tty)
+ *
+ *      Install a new tty into the tty driver internal tables. Used in
+ *      conjunction with lookup and remove methods.
+ *
+ *      Optional method. Default behaviour is to use the ttys array
+ *
+ * void (*remove)(struct tty_driver *self, struct tty_struct *tty)
+ *
+ *      Remove a closed tty from the tty driver internal tables. Used in
+ *      conjunction with lookup and remove methods.
+ *
+ *      Optional method. Default behaviour is to use the ttys array
+ *
  * int  (*open)(struct tty_struct * tty, struct file * filp);
  *
  *      This routine is called when a particular tty device is opened.
@@ -212,6 +226,8 @@ struct tty_driver;
 
 struct tty_operations {
         struct tty_struct * (*lookup)(struct tty_driver *driver, int idx);
+        int  (*install)(struct tty_driver *driver, struct tty_struct *tty);
+        void (*remove)(struct tty_driver *driver, struct tty_struct *tty);
         int  (*open)(struct tty_struct * tty, struct file * filp);
         void (*close)(struct tty_struct * tty, struct file * filp);
         void (*shutdown)(struct tty_struct *tty);