bfs_add_entry
err = bfs_add_entry(dir, &dentry->d_name, inode->i_ino);
err = bfs_add_entry(dir, &new->d_name, inode->i_ino);
error = bfs_add_entry(new_dir, &new_dentry->d_name,
static int bfs_add_entry(struct inode *dir, const struct qstr *child, int ino);