From a6f37daa8b892fd29dd71be0de61460a478cb122 Mon Sep 17 00:00:00 2001 From: Sukadev Bhattiprolu Date: Mon, 13 Oct 2008 10:43:27 +0100 Subject: [PATCH] Simplify devpts_pty_kill When creating a new pty, save the pty's inode in the tty->driver_data. Use this inode in pty_kill() to identify the devpts instance. Since we now have the inode for the pty, we can skip get_node() lookup and remove the unused get_node(). TODO: - check if the mutex_lock is needed in pty_kill(). Signed-off-by: Sukadev Bhattiprolu Signed-off-by: Alan Cox Signed-off-by: Linus Torvalds --- fs/devpts/inode.c | 29 ++++++++++++----------------- 1 file changed, 12 insertions(+), 17 deletions(-) diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c index 50e885f84bb..a70d5d0890c 100644 --- a/fs/devpts/inode.c +++ b/fs/devpts/inode.c @@ -170,14 +170,6 @@ static struct file_system_type devpts_fs_type = { * to the System V naming convention */ -static struct dentry *get_node(int num) -{ - char s[12]; - struct dentry *root = devpts_root; - mutex_lock(&root->d_inode->i_mutex); - return lookup_one_len(s, root, sprintf(s, "%d", num)); -} - int devpts_new_index(struct inode *ptmx_inode) { int index; @@ -235,6 +227,7 @@ int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty) inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; init_special_inode(inode, S_IFCHR|config.mode, device); inode->i_private = tty; + tty->driver_data = inode; sprintf(s, "%d", number); @@ -262,18 +255,20 @@ struct tty_struct *devpts_get_tty(struct inode *pts_inode, int number) void devpts_pty_kill(struct tty_struct *tty) { - int number = tty->index; - struct dentry *dentry = get_node(number); + struct inode *inode = tty->driver_data; + struct dentry *dentry; - if (!IS_ERR(dentry)) { - struct inode *inode = dentry->d_inode; - if (inode) { - inode->i_nlink--; - d_delete(dentry); - dput(dentry); - } + BUG_ON(inode->i_rdev == MKDEV(TTYAUX_MAJOR, PTMX_MINOR)); + + mutex_lock(&devpts_root->d_inode->i_mutex); + + dentry = d_find_alias(inode); + if (dentry && !IS_ERR(dentry)) { + inode->i_nlink--; + d_delete(dentry); dput(dentry); } + mutex_unlock(&devpts_root->d_inode->i_mutex); } -- 2.41.1