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block: prepare for multiple request_lists

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Request allocation is about to be made per-blkg meaning that there'll
be multiple request lists.

* Make queue full state per request_list.  blk_*queue_full() functions
  are renamed to blk_*rl_full() and takes @rl instead of @q.

* Rename blk_init_free_list() to blk_init_rl() and make it take @rl
  instead of @q.  Also add @gfp_mask parameter.

* Add blk_exit_rl() instead of destroying rl directly from
  blk_release_queue().

* Add request_list->q and make request alloc/free functions -
  blk_free_request(), [__]freed_request(), __get_request() - take @rl
  instead of @q.

This patch doesn't introduce any functional difference.

Signed-off-by: Tejun Heo <[email protected]>
Acked-by: Vivek Goyal <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2012-06-04 20:40:59 -07:00 • committed by Jens Axboe
commit 5b788ce3e2
4 changed files with 57 additions and 46 deletions
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12
block/blk-sysfs.c
View file

@ -66,16 +66,16 @@ queue_requests_store(struct request_queue *q, const char *page, size_t count)
blk_clear_queue_congested(q, BLK_RW_ASYNC);
if (rl->count[BLK_RW_SYNC] >= q->nr_requests) {
blk_set_queue_full(q, BLK_RW_SYNC);
blk_set_rl_full(rl, BLK_RW_SYNC);
} else {
blk_clear_queue_full(q, BLK_RW_SYNC);
blk_clear_rl_full(rl, BLK_RW_SYNC);
wake_up(&rl->wait[BLK_RW_SYNC]);
}
if (rl->count[BLK_RW_ASYNC] >= q->nr_requests) {
blk_set_queue_full(q, BLK_RW_ASYNC);
blk_set_rl_full(rl, BLK_RW_ASYNC);
} else {
blk_clear_queue_full(q, BLK_RW_ASYNC);
blk_clear_rl_full(rl, BLK_RW_ASYNC);
wake_up(&rl->wait[BLK_RW_ASYNC]);
}
spin_unlock_irq(q->queue_lock);
@ -476,7 +476,6 @@ static void blk_release_queue(struct kobject *kobj)
{
struct request_queue *q =
container_of(kobj, struct request_queue, kobj);
struct request_list *rl = &q->rq;
blk_sync_queue(q);
@ -489,8 +488,7 @@ static void blk_release_queue(struct kobject *kobj)
elevator_exit(q->elevator);
}
if (rl->rq_pool)
mempool_destroy(rl->rq_pool);
blk_exit_rl(&q->rq);
if (q->queue_tags)
__blk_queue_free_tags(q);