Correct the comments since bfq_fifo_expire[0] is for async request,
while bfq_fifo_expire[1] is for sync request.
Also update docs, according the source code, the default
fifo_expire_async is 250ms, and fifo_expire_sync is 125ms.
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit 4168a8d27ed3a00f160e7f885c956f060d2a0741)
(cherry picked from commit a31ff2eb7d7cfa8331e513bb282f304117f18a77)
(cherry picked from commit a78637befaa4106f9858b3ad8e3273960d3de82b)
(cherry picked from commit bd8e7d3845c7a3b602aee361c7e3d0b5764ce060)
(cherry picked from commit a8543954accfadbb9a1cf1f64c6b3749ee3a629b)
(cherry picked from commit 960981f44b77dcd0d4e786aaef72d39057ccfc03)
(cherry picked from commit 50cfb4b6c1c2e4a3778f66510fee7a2e86e053f2)
