block: prepare for multiple request_lists

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 <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 5 insertions, 7 deletions

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index aa41b47c22d2..234ce7c082fa 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -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);