add_dirent_to_buf
retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh2);
retval = add_dirent_to_buf(handle, &fname, dir, inode,
retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh);
err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh);
err = add_dirent_to_buf(handle, fname, dir, inode, de, bh);