void bdrv_io_limits_enable(BlockDriverState *bs) { assert(!bs->io_limits_enabled); throttle_init(&bs->throttle_state, bdrv_get_aio_context(bs), QEMU_CLOCK_VIRTUAL, bdrv_throttle_read_timer_cb, bdrv_throttle_write_timer_cb, bs); bs->io_limits_enabled = true; }