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block, cfq: move cfqd->icq_list to request_queue and add request->elv.icq

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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: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo
2011-12-14 00:33:41 +01:00
committed by Jens Axboe
parent c586980732
commit a612fddf0d
4 changed files with 20 additions and 21 deletions
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10
include/linux/blkdev.h
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@@ -111,10 +111,14 @@ struct request {
* Three pointers are available for the IO schedulers, if they need
* more they have to dynamically allocate it. Flush requests are
* never put on the IO scheduler. So let the flush fields share
* space with the three elevator_private pointers.
* space with the elevator data.
*/
union {
void *elevator_private[3];
struct {
struct io_cq *icq;
void *priv[2];
} elv;
struct {
unsigned int seq;
struct list_head list;
@@ -357,6 +361,8 @@ struct request_queue {
struct timer_list timeout;
struct list_head timeout_list;
struct list_head icq_list;
struct queue_limits limits;
/*