block: remove request_list code

It's now dead code, nobody uses it.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 0 insertions, 47 deletions

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 41b2470042d1..6c65791bc3fe 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -76,9 +76,6 @@ static void blkg_free(struct blkcg_gq *blkg)
 		if (blkg->pd[i])
 			blkcg_policy[i]->pd_free_fn(blkg->pd[i]);
 
-	if (blkg->blkcg != &blkcg_root)
-		blk_exit_rl(blkg->q, &blkg->rl);
-
 	blkg_rwstat_exit(&blkg->stat_ios);
 	blkg_rwstat_exit(&blkg->stat_bytes);
 	kfree(blkg);
@@ -112,13 +109,6 @@ static struct blkcg_gq *blkg_alloc(struct blkcg *blkcg, struct request_queue *q,
 	blkg->blkcg = blkcg;
 	atomic_set(&blkg->refcnt, 1);
 
-	/* root blkg uses @q->root_rl, init rl only for !root blkgs */
-	if (blkcg != &blkcg_root) {
-		if (blk_init_rl(&blkg->rl, q, gfp_mask))
-			goto err_free;
-		blkg->rl.blkg = blkg;
-	}
-
 	for (i = 0; i < BLKCG_MAX_POLS; i++) {
 		struct blkcg_policy *pol = blkcg_policy[i];
 		struct blkg_policy_data *pd;
@@ -377,7 +367,6 @@ static void blkg_destroy_all(struct request_queue *q)
 	}
 
 	q->root_blkg = NULL;
-	q->root_rl.blkg = NULL;
 }
 
 /*
@@ -403,41 +392,6 @@ void __blkg_release_rcu(struct rcu_head *rcu_head)
 }
 EXPORT_SYMBOL_GPL(__blkg_release_rcu);
 
-/*
- * The next function used by blk_queue_for_each_rl().  It's a bit tricky
- * because the root blkg uses @q->root_rl instead of its own rl.
- */
-struct request_list *__blk_queue_next_rl(struct request_list *rl,
-					 struct request_queue *q)
-{
-	struct list_head *ent;
-	struct blkcg_gq *blkg;
-
-	/*
-	 * Determine the current blkg list_head.  The first entry is
-	 * root_rl which is off @q->blkg_list and mapped to the head.
-	 */
-	if (rl == &q->root_rl) {
-		ent = &q->blkg_list;
-		/* There are no more block groups, hence no request lists */
-		if (list_empty(ent))
-			return NULL;
-	} else {
-		blkg = container_of(rl, struct blkcg_gq, rl);
-		ent = &blkg->q_node;
-	}
-
-	/* walk to the next list_head, skip root blkcg */
-	ent = ent->next;
-	if (ent == &q->root_blkg->q_node)
-		ent = ent->next;
-	if (ent == &q->blkg_list)
-		return NULL;
-
-	blkg = container_of(ent, struct blkcg_gq, q_node);
-	return &blkg->rl;
-}
-
 static int blkcg_reset_stats(struct cgroup_subsys_state *css,
 			     struct cftype *cftype, u64 val)
 {
@@ -1230,7 +1184,6 @@ int blkcg_init_queue(struct request_queue *q)
 	if (IS_ERR(blkg))
 		goto err_unlock;
 	q->root_blkg = blkg;
-	q->root_rl.blkg = blkg;
 	spin_unlock_irq(q->queue_lock);
 	rcu_read_unlock();