seq_path_root
err = seq_path_root(seq, &mnt_path, &s->root, "");
err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
int seq_path_root(struct seq_file *m, const struct path *path,