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With a multi-actuator drive, a process may get associated with multiple bfq_queues: one queue for each of the N actuators. So, the bfq_io_cq data structure must be able to accommodate its per-queue persistent information for N queues. Currently it stores this information for just one queue, in several scalar fields. This is a preparatory commit for moving to accommodating persistent information for N queues. In particular, this commit packs all the above scalar fields into a single data structure. Then there is now only one field, in bfq_io_cq, that stores all the above information. This scalar field will then be turned into an array by a following commit. Suggested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Signed-off-by: Gianmarco Lusvardi <glusvardi@posteo.net> Signed-off-by: Giulio Barabino <giuliobarabino99@gmail.com> Signed-off-by: Emiliano Maccaferri <inbox@emilianomaccaferri.com> Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Link: https://lore.kernel.org/r/20230103145503.71712-4-paolo.valente@linaro.org Signed-off-by: Jens Axboe <axboe@kernel.dk>