tree 18b1306aa0a86c1c987bab5d3f2e9610f47bbb8b
parent 60f2df8a29df5f2db2c87fd23122a1cebdf2011a
author Ming Lei <tom.leiming@gmail.com> 1399758194 -0600
committer Jens Axboe <axboe@fb.com> 1399758194 -0600

blk-mq: bitmap tag: select random tag betweet 0 and (depth - 1)

The selected tag should be selected at random between 0 and
(depth - 1) with probability 1/depth, instead between 0 and
(depth - 2) with probability 1/(depth - 1).

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>