bcache: use bio_{start,end}_io_acct
Switch bcache to use the nicer bio accounting helpers, and call the routines where we also sample the start time to give coherent accounting results. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NKonstantin Khlebnikov <khlebnikov@yandex-team.ru> Acked-by: NColy Li <colyli@suse.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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