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>

4 files changed, 0 insertions, 129 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();
 
diff --git a/block/blk-core.c b/block/blk-core.c
index ccfe2a65cc22..45f5c5898fd7 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -450,81 +450,6 @@ void blk_cleanup_queue(struct request_queue *q)
 }
 EXPORT_SYMBOL(blk_cleanup_queue);
 
-/* Allocate memory local to the request queue */
-static void *alloc_request_simple(gfp_t gfp_mask, void *data)
-{
-	struct request_queue *q = data;
-
-	return kmem_cache_alloc_node(request_cachep, gfp_mask, q->node);
-}
-
-static void free_request_simple(void *element, void *data)
-{
-	kmem_cache_free(request_cachep, element);
-}
-
-static void *alloc_request_size(gfp_t gfp_mask, void *data)
-{
-	struct request_queue *q = data;
-	struct request *rq;
-
-	rq = kmalloc_node(sizeof(struct request) + q->cmd_size, gfp_mask,
-			q->node);
-	if (rq && q->init_rq_fn && q->init_rq_fn(q, rq, gfp_mask) < 0) {
-		kfree(rq);
-		rq = NULL;
-	}
-	return rq;
-}
-
-static void free_request_size(void *element, void *data)
-{
-	struct request_queue *q = data;
-
-	if (q->exit_rq_fn)
-		q->exit_rq_fn(q, element);
-	kfree(element);
-}
-
-int blk_init_rl(struct request_list *rl, struct request_queue *q,
-		gfp_t gfp_mask)
-{
-	if (unlikely(rl->rq_pool) || q->mq_ops)
-		return 0;
-
-	rl->q = q;
-	rl->count[BLK_RW_SYNC] = rl->count[BLK_RW_ASYNC] = 0;
-	rl->starved[BLK_RW_SYNC] = rl->starved[BLK_RW_ASYNC] = 0;
-	init_waitqueue_head(&rl->wait[BLK_RW_SYNC]);
-	init_waitqueue_head(&rl->wait[BLK_RW_ASYNC]);
-
-	if (q->cmd_size) {
-		rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ,
-				alloc_request_size, free_request_size,
-				q, gfp_mask, q->node);
-	} else {
-		rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ,
-				alloc_request_simple, free_request_simple,
-				q, gfp_mask, q->node);
-	}
-	if (!rl->rq_pool)
-		return -ENOMEM;
-
-	if (rl != &q->root_rl)
-		WARN_ON_ONCE(!blk_get_queue(q));
-
-	return 0;
-}
-
-void blk_exit_rl(struct request_queue *q, struct request_list *rl)
-{
-	if (rl->rq_pool) {
-		mempool_destroy(rl->rq_pool);
-		if (rl != &q->root_rl)
-			blk_put_queue(q);
-	}
-}
-
 struct request_queue *blk_alloc_queue(gfp_t gfp_mask)
 {
 	return blk_alloc_queue_node(gfp_mask, NUMA_NO_NODE, NULL);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index d106d7a970cc..2600cba56408 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -326,10 +326,6 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
 	rq->end_io_data = NULL;
 	rq->next_rq = NULL;
 
-#ifdef CONFIG_BLK_CGROUP
-	rq->rl = NULL;
-#endif
-
 	data->ctx->rq_dispatched[op_is_sync(op)]++;
 	refcount_set(&rq->ref, 1);
 	return rq;
diff --git a/block/blk.h b/block/blk.h
index 4ae6cacb4548..e925cf4fe4de 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -120,9 +120,6 @@ struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q,
 		int node, int cmd_size, gfp_t flags);
 void blk_free_flush_queue(struct blk_flush_queue *q);
 
-int blk_init_rl(struct request_list *rl, struct request_queue *q,
-		gfp_t gfp_mask);
-void blk_exit_rl(struct request_queue *q, struct request_list *rl);
 void blk_exit_queue(struct request_queue *q);
 void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
 			struct bio *bio);