static int vhdx_allocate_block(BlockDriverState *bs, BDRVVHDXState *s,
                                    uint64_t *new_offset)
{
    *new_offset = bdrv_getlength(bs->file);

    /* per the spec, the address for a block is in units of 1MB */
    *new_offset = ROUND_UP(*new_offset, 1024 * 1024);

    return bdrv_truncate(bs->file, *new_offset + s->block_size);
}
Unknown