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Subsequent patches will split the single queue into separate bps and iops queues. To prevent IO that has already passed through the bps queue at a single tg level from being counted toward bps wait time again, we introduce "BIO_TG_BPS_THROTTLED" flag. Since throttle and QoS operate at different levels, we reuse the value as "BIO_QOS_THROTTLED". We set this flag when charge bps and clear it when charge iops, as the bio will move to the upper-level tg or be dispatched. This patch does not involve functional changes. Signed-off-by: Zizhi Wo <wozizhi@huawei.com> Reviewed-by: Yu Kuai <yukuai3@huawei.com> Signed-off-by: Zizhi Wo <wozizhi@huaweicloud.com> Link: https://lore.kernel.org/r/20250506020935.655574-5-wozizhi@huaweicloud.com Signed-off-by: Jens Axboe <axboe@kernel.dk>