5 files changed, 47 insertions, 30 deletions

diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index c5a192dd00db..a391badef52a 100644
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -60,7 +60,7 @@ static void pty_close(struct tty_struct * tty, struct file * filp)
                 set_bit(TTY_OTHER_CLOSED, &tty->flags);
 #ifdef CONFIG_UNIX98_PTYS
                 if (tty->driver == ptm_driver)
-                        devpts_pty_kill(tty->index);
+                        devpts_pty_kill(tty->link);
 #endif
                 tty_vhangup(tty->link);
         }
@@ -453,9 +453,10 @@ static int pty_unix98_ioctl(struct tty_struct *tty, struct file *file,
  *      This provides our locking.
  */
 
-static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, int idx)
+static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
+                struct inode *ptm_inode, int idx)
 {
-        struct tty_struct *tty = devpts_get_tty(idx);
+        struct tty_struct *tty = devpts_get_tty(ptm_inode, idx);
         if (tty)
                 tty = tty->link;
         return tty;
@@ -470,9 +471,10 @@ static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, int idx)
  *      This provides our locking.
  */
 
-static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, int idx)
+static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
+                struct inode *pts_inode, int idx)
 {
-        struct tty_struct *tty = devpts_get_tty(idx);
+        struct tty_struct *tty = devpts_get_tty(pts_inode, idx);
         /* Master must be open before slave */
         if (!tty)
                 return ERR_PTR(-EIO);
@@ -602,7 +604,7 @@ static int __ptmx_open(struct inode *inode, struct file *filp)
         nonseekable_open(inode, filp);
 
         /* find a device that is not in use. */
-        index = devpts_new_index();
+        index = devpts_new_index(inode);
         if (index < 0)
                 return index;
 
@@ -619,7 +621,7 @@ static int __ptmx_open(struct inode *inode, struct file *filp)
         filp->private_data = tty;
         file_move(filp, &tty->tty_files);
 
-        retval = devpts_pty_new(tty->link);
+        retval = devpts_pty_new(inode, tty->link);
         if (retval)
                 goto out1;
 
@@ -630,7 +632,7 @@ out1:
         tty_release_dev(filp);
         return retval;
 out:
-        devpts_kill_index(index);
+        devpts_kill_index(inode, index);
         return retval;
 }
 
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 36098ee8fe65..959083961024 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1213,12 +1213,13 @@ static void tty_line_name(struct tty_driver *driver, int index, char *p)
  *      be held until the 'fast-open' is also done. Will change once we
  *      have refcounting in the driver and per driver locking
  */
-struct tty_struct *tty_driver_lookup_tty(struct tty_driver *driver, int idx)
+struct tty_struct *tty_driver_lookup_tty(struct tty_driver *driver,
+                struct inode *inode, int idx)
 {
         struct tty_struct *tty;
 
         if (driver->ops->lookup)
-                return driver->ops->lookup(driver, idx);
+                return driver->ops->lookup(driver, inode, idx);
 
         tty = driver->ttys[idx];
         return tty;
@@ -1539,10 +1540,11 @@ void tty_release_dev(struct file *filp)
         int     devpts;
         int     idx;
         char    buf[64];
+        struct  inode *inode;
 
+        inode = filp->f_path.dentry->d_inode;
         tty = (struct tty_struct *)filp->private_data;
-        if (tty_paranoia_check(tty, filp->f_path.dentry->d_inode,
-                                                        "tty_release_dev"))
+        if (tty_paranoia_check(tty, inode, "tty_release_dev"))
                 return;
 
         check_tty_count(tty, "tty_release_dev");
@@ -1751,7 +1753,7 @@ void tty_release_dev(struct file *filp)
 
         /* Make this pty number available for reallocation */
         if (devpts)
-                devpts_kill_index(idx);
+                devpts_kill_index(inode, idx);
 }
 
 /**
@@ -1836,7 +1838,7 @@ retry_open:
 got_driver:
         if (!tty) {
                 /* check whether we're reopening an existing tty */
-                tty = tty_driver_lookup_tty(driver, index);
+                tty = tty_driver_lookup_tty(driver, inode, index);
 
                 if (IS_ERR(tty))
                         return PTR_ERR(tty);
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 488eb424f662..638db9b769ac 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -177,7 +177,7 @@ static struct dentry *get_node(int num)
         return lookup_one_len(s, root, sprintf(s, "%d", num));
 }
 
-int devpts_new_index(void)
+int devpts_new_index(struct inode *ptmx_inode)
 {
         int index;
         int ida_ret;
@@ -205,14 +205,14 @@ retry:
         return index;
 }
 
-void devpts_kill_index(int idx)
+void devpts_kill_index(struct inode *ptmx_inode, int idx)
 {
         mutex_lock(&allocated_ptys_lock);
         ida_remove(&allocated_ptys, idx);
         mutex_unlock(&allocated_ptys_lock);
 }
 
-int devpts_pty_new(struct tty_struct *tty)
+int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
 {
         int number = tty->index; /* tty layer puts index from devpts_new_index() in here */
         struct tty_driver *driver = tty->driver;
@@ -245,7 +245,7 @@ int devpts_pty_new(struct tty_struct *tty)
         return 0;
 }
 
-struct tty_struct *devpts_get_tty(int number)
+struct tty_struct *devpts_get_tty(struct inode *pts_inode, int number)
 {
         struct dentry *dentry = get_node(number);
         struct tty_struct *tty;
@@ -262,8 +262,9 @@ struct tty_struct *devpts_get_tty(int number)
         return tty;
 }
 
-void devpts_pty_kill(int number)
+void devpts_pty_kill(struct tty_struct *tty)
 {
+        int number = tty->index;
         struct dentry *dentry = get_node(number);
 
         if (!IS_ERR(dentry)) {
diff --git a/include/linux/devpts_fs.h b/include/linux/devpts_fs.h
index 154769cad3f3..5ce0e5fd712e 100644
--- a/include/linux/devpts_fs.h
+++ b/include/linux/devpts_fs.h
@@ -17,20 +17,31 @@
 
 #ifdef CONFIG_UNIX98_PTYS
 
-int devpts_new_index(void);
-void devpts_kill_index(int idx);
-int devpts_pty_new(struct tty_struct *tty);      /* mknod in devpts */
-struct tty_struct *devpts_get_tty(int number);   /* get tty structure */
-void devpts_pty_kill(int number);                /* unlink */
+int devpts_new_index(struct inode *ptmx_inode);
+void devpts_kill_index(struct inode *ptmx_inode, int idx);
+/* mknod in devpts */
+int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty);
+/* get tty structure */
+struct tty_struct *devpts_get_tty(struct inode *pts_inode, int number);
+/* unlink */
+void devpts_pty_kill(struct tty_struct *tty);
 
 #else
 
 /* Dummy stubs in the no-pty case */
-static inline int devpts_new_index(void) { return -EINVAL; }
-static inline void devpts_kill_index(int idx) { }
-static inline int devpts_pty_new(struct tty_struct *tty) { return -EINVAL; }
-static inline struct tty_struct *devpts_get_tty(int number) { return NULL; }
-static inline void devpts_pty_kill(int number) { }
+static inline int devpts_new_index(struct inode *ptmx_inode) { return -EINVAL; }
+static inline void devpts_kill_index(struct inode *ptmx_inode, int idx) { }
+static inline int devpts_pty_new(struct inode *ptmx_inode,
+                                struct tty_struct *tty)
+{
+        return -EINVAL;
+}
+static inline struct tty_struct *devpts_get_tty(struct inode *pts_inode,
+                int number)
+{
+        return NULL;
+}
+static inline void devpts_pty_kill(struct tty_struct *tty) { }
 
 #endif
 
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 005d06ad46a6..78416b901589 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -225,7 +225,8 @@ struct tty_struct;
 struct tty_driver;
 
 struct tty_operations {
-        struct tty_struct * (*lookup)(struct tty_driver *driver, int idx);
+        struct tty_struct * (*lookup)(struct tty_driver *driver,
+                        struct inode *inode, 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);