devpts: more pty driver interface cleanups

This is more prep-work for the upcoming pty changes.  Still just code
cleanup with no actual semantic changes.

This removes a bunch pointless complexity by just having the slave pty
side remember the dentry associated with the devpts slave rather than
the inode.  That allows us to remove all the "look up the dentry" code
for when we want to remove it again.

Together with moving the tty pointer from "inode->i_private" to
"dentry->d_fsdata" and getting rid of pointless inode locking, this
removes about 30 lines of code.  Not only is the end result smaller,
it's simpler and easier to understand.

The old code, for example, depended on the d_find_alias() to not just
find the dentry, but also to check that it is still hashed, which in
turn validated the tty pointer in the inode.

That is a _very_ roundabout way to say "invalidate the cached tty
pointer when the dentry is removed".

The new code just does

	dentry->d_fsdata = NULL;

in devpts_pty_kill() instead, invalidating the tty pointer rather more
directly and obviously.  Don't do something complex and subtle when the
obvious straightforward approach will do.

The rest of the patch (ie apart from code deletion and the above tty
pointer clearing) is just switching the calling convention to pass the
dentry or file pointer around instead of the inode.

Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Peter Anvin <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Serge Hallyn <serge.hallyn@ubuntu.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Cc: Jann Horn <jann@thejh.net>
Cc: Greg KH <greg@kroah.com>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Florian Weimer <fw@deneb.enyo.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 10 deletions

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 0058d9fbf931..cf0dc51a2690 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -626,7 +626,7 @@ static int pty_unix98_ioctl(struct tty_struct *tty,
  */
 
 static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
-		struct inode *ptm_inode, int idx)
+		struct file *file, int idx)
 {
 	/* Master must be open via /dev/ptmx */
 	return ERR_PTR(-EIO);
@@ -642,12 +642,12 @@ static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
  */
 
 static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
-		struct inode *pts_inode, int idx)
+		struct file *file, int idx)
 {
 	struct tty_struct *tty;
 
 	mutex_lock(&devpts_mutex);
-	tty = devpts_get_priv(pts_inode);
+	tty = devpts_get_priv(file->f_path.dentry);
 	mutex_unlock(&devpts_mutex);
 	/* Master must be open before slave */
 	if (!tty)
@@ -722,7 +722,7 @@ static int ptmx_open(struct inode *inode, struct file *filp)
 {
 	struct pts_fs_info *fsi;
 	struct tty_struct *tty;
-	struct inode *slave_inode;
+	struct dentry *dentry;
 	int retval;
 	int index;
 
@@ -769,14 +769,12 @@ static int ptmx_open(struct inode *inode, struct file *filp)
 
 	tty_add_file(tty, filp);
 
-	slave_inode = devpts_pty_new(fsi,
-			MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index,
-			tty->link);
-	if (IS_ERR(slave_inode)) {
-		retval = PTR_ERR(slave_inode);
+	dentry = devpts_pty_new(fsi, index, tty->link);
+	if (IS_ERR(dentry)) {
+		retval = PTR_ERR(dentry);
 		goto err_release;
 	}
-	tty->link->driver_data = slave_inode;
+	tty->link->driver_data = dentry;
 
 	retval = ptm_driver->ops->open(tty, filp);
 	if (retval)