ntfs_index_add_filename
int ntfs_index_add_filename(struct ntfs_inode *ni, struct file_name_attr *fn, u64 mref);
err = ntfs_index_add_filename(dir_ni, fn, MK_MREF(ni->mft_no,
err = ntfs_index_add_filename(dir_ni, fn, child_mft_ref);