blk-throttle: cap discard request size
discard request usually is very big and easily use all bandwidth budget of a cgroup. discard request size doesn't really mean the size of data written, so it doesn't make sense to account it into bandwidth budget. Jens pointed out treating the size 0 doesn't make sense too, because discard request does have cost. But it's not easy to find the actual cost. This patch simply makes the size one sector. Signed-off-by: NShaohua Li <shli@fb.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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