block, bfq: save also injection state on queue merging
To prevent injection information from being lost on bfq_queue merging, also the amount of service that a bfq_queue receives must be saved and restored when the bfq_queue is merged and split, respectively. Tested-by: NJan Kara <jack@suse.cz> Signed-off-by: NPaolo Valente <paolo.valente@linaro.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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