return __follow_down(mnt,dentry);
struct vfsmount *mounted;  mounted = lookup_mnt(*mnt, *dentry); if (mounted) { dput(*dentry); mntput(*mnt); *mnt = mounted; *dentry = dget(mounted->mnt_root); return 1; } return 0;
int follow_down(struct vfsmount **mnt, struct dentry **dentry){	return __follow_down(mnt,dentry);}