static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, const uint8_t *buf, int nb_sectors) { int async_ret; BlockDriverAIOCB *acb; async_ret = NOT_DONE; qemu_aio_wait_start(); acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, bdrv_rw_em_cb, &async_ret); if (acb == NULL) { qemu_aio_wait_end(); return -1; } while (async_ret == NOT_DONE) { qemu_aio_wait(); } qemu_aio_wait_end(); return async_ret; }