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    block, cfq: move cfqd->icq_list to request_queue and add request->elv.icq · a612fddf
    Tejun Heo 提交于
    Most of icq management is about to be moved out of cfq into blk-ioc.
    This patch prepares for it.
    
    * Move cfqd->icq_list to request_queue->icq_list
    
    * Make request explicitly point to icq instead of through elevator
      private data.  ->elevator_private[3] is replaced with sub struct elv
      which contains icq pointer and priv[2].  cfq is updated accordingly.
    
    * Meaningless clearing of ->elevator_private[0] removed from
      elv_set_request().  At that point in code, the field was guaranteed
      to be %NULL anyway.
    
    This patch doesn't introduce any functional change.
    Signed-off-by: NTejun Heo <tj@kernel.org>
    Signed-off-by: NJens Axboe <axboe@kernel.dk>
    a612fddf
cfq-iosched.c 104.5 KB