channel_name = file->f_dentry->d_parent->d_name.name;
trace_name = file->f_dentry->d_parent->d_parent->d_parent->d_name.name;
channel_name = file->f_dentry->d_parent->d_name.name;
trace_name = file->f_dentry->d_parent->d_parent->d_parent->d_name.name;