static void alloc_aio_bitmap(BlkMigDevState *bmds) { BlockDriverState *bs = bmds->bs; int64_t bitmap_size; bitmap_size = bdrv_nb_sectors(bs) + BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; bmds->aio_bitmap = g_malloc0(bitmap_size); }