block, bfq: add missing invocations of bfqg_stats_update_io_add/remove
bfqg_stats_update_io_add and bfqg_stats_update_io_remove are to be invoked, respectively, when an I/O request enters and when an I/O request exits the scheduler. Unfortunately, bfq does not fully comply with this scheme, because it does not invoke these functions for requests that are inserted into or extracted from its priority dispatch list. This commit fixes this mistake. Tested-by: Lee Tibbert <lee.tibbert@gmail.com> Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name> Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Luca Miccio <lucmiccio@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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