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Now ->carryover_bytes[] and ->carryover_ios[] only covers limit/config update. Actually the carryover bytes/ios can be carried to ->bytes_disp[] and ->io_disp[] directly, since the carryover is one-shot thing and only valid in current slice. Then we can remove the two fields and simplify code much. Type of ->bytes_disp[] and ->io_disp[] has to change as signed because the two fields may become negative when updating limits or config, but both are big enough for holding bytes/ios dispatched in single slice Cc: Tejun Heo <tj@kernel.org> Cc: Josef Bacik <josef@toxicpanda.com> Cc: Yu Kuai <yukuai3@huawei.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Acked-by: Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20250305043123.3938491-4-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>