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-rw-r--r--fs/devpts/inode.c68
1 files changed, 31 insertions, 37 deletions
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 488eb424f662..4a714f6c1bed 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -27,6 +27,7 @@
#define DEVPTS_SUPER_MAGIC 0x1cd1
#define DEVPTS_DEFAULT_MODE 0600
+#define PTMX_MINOR 2
extern int pty_limit; /* Config limit on Unix98 ptys */
static DEFINE_IDA(allocated_ptys);
@@ -48,7 +49,7 @@ enum {
Opt_err
};
-static match_table_t tokens = {
+static const match_table_t tokens = {
{Opt_uid, "uid=%u"},
{Opt_gid, "gid=%u"},
{Opt_mode, "mode=%o"},
@@ -169,15 +170,7 @@ 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(void)
+int devpts_new_index(struct inode *ptmx_inode)
{
int index;
int ida_ret;
@@ -205,20 +198,21 @@ 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;
dev_t device = MKDEV(driver->major, driver->minor_start+number);
struct dentry *dentry;
struct inode *inode = new_inode(devpts_mnt->mnt_sb);
+ char s[12];
/* We're supposed to be given the slave end of a pty */
BUG_ON(driver->type != TTY_DRIVER_TYPE_PTY);
@@ -233,10 +227,15 @@ int devpts_pty_new(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;
- dentry = get_node(number);
- if (!IS_ERR(dentry) && !dentry->d_inode) {
- d_instantiate(dentry, inode);
+ sprintf(s, "%d", number);
+
+ mutex_lock(&devpts_root->d_inode->i_mutex);
+
+ dentry = d_alloc_name(devpts_root, s);
+ if (!IS_ERR(dentry)) {
+ d_add(dentry, inode);
fsnotify_create(devpts_root->d_inode, dentry);
}
@@ -245,36 +244,31 @@ 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;
-
- tty = NULL;
- if (!IS_ERR(dentry)) {
- if (dentry->d_inode)
- tty = dentry->d_inode->i_private;
- dput(dentry);
- }
+ BUG_ON(pts_inode->i_rdev == MKDEV(TTYAUX_MAJOR, PTMX_MINOR));
- mutex_unlock(&devpts_root->d_inode->i_mutex);
-
- return tty;
+ if (pts_inode->i_sb->s_magic == DEVPTS_SUPER_MAGIC)
+ return (struct tty_struct *)pts_inode->i_private;
+ return NULL;
}
-void devpts_pty_kill(int number)
+void devpts_pty_kill(struct tty_struct *tty)
{
- 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);
}