linux-kernel - [RFC V2 6/6] blk: remove unused interfaces of blk-rq-qos

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Message-Id: <20220215123705.58968-7-jianchao.wan9@gmail.com>
Date:   Tue, 15 Feb 2022 20:37:05 +0800
From:   "Wang Jianchao (Kuaishou)" <jianchao.wan9@...il.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     hch@...radead.org, Josef Bacik <jbacik@...com>,
        Tejun Heo <tj@...nel.org>,
        Bart Van Assche <bvanassche@....org>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC V2 6/6] blk: remove unused interfaces of blk-rq-qos

No functional changes here

Signed-off-by: Wang Jianchao (Kuaishou) <jianchao.wan9@...il.com>
---
 block/blk-mq-debugfs.c | 10 +-------
 block/blk-rq-qos.h     | 52 +-----------------------------------------
 2 files changed, 2 insertions(+), 60 deletions(-)

diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 70a3e4599d99..23336c879e0b 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -820,11 +820,6 @@ void blk_mq_debugfs_unregister_sched(struct request_queue *q)
 	q->sched_debugfs_dir = NULL;
 }
 
-static const char *rq_qos_id_to_name(enum rq_qos_id id)
-{
-	return "unknown";
-}
-
 void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
 {
 	debugfs_remove_recursive(rqos->debugfs_dir);
@@ -834,9 +829,6 @@ void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
 void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
 {
 	struct request_queue *q = rqos->q;
-	const char *dir_name;
-
-	dir_name = rqos->ops->name ? rqos->ops->name : rq_qos_id_to_name(rqos->id);
 
 	if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
 		return;
@@ -845,7 +837,7 @@ void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
 		q->rqos_debugfs_dir = debugfs_create_dir("rqos",
 							 q->debugfs_dir);
 
-	rqos->debugfs_dir = debugfs_create_dir(dir_name,
+	rqos->debugfs_dir = debugfs_create_dir(rqos->ops->name,
 					       rqos->q->rqos_debugfs_dir);
 
 	debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index ee396367a5b2..123b6b100355 100644
--- a/block/blk-rq-qos.h
+++ b/block/blk-rq-qos.h
@@ -13,10 +13,6 @@
 
 struct blk_mq_debugfs_attr;
 
-enum rq_qos_id {
-	RQ_QOS_UNUSED,
-};
-
 struct rq_wait {
 	wait_queue_head_t wait;
 	atomic_t inflight;
@@ -28,7 +24,7 @@ struct rq_qos {
 	bool dying;
 	const struct rq_qos_ops *ops;
 	struct request_queue *q;
-	enum rq_qos_id id;
+	int id;
 	struct rq_qos *next;
 #ifdef CONFIG_BLK_DEBUG_FS
 	struct dentry *debugfs_dir;
@@ -89,52 +85,6 @@ static inline void rq_wait_init(struct rq_wait *rq_wait)
 	init_waitqueue_head(&rq_wait->wait);
 }
 
-static inline void rq_qos_add(struct request_queue *q, struct rq_qos *rqos)
-{
-	/*
-	 * No IO can be in-flight when adding rqos, so freeze queue, which
-	 * is fine since we only support rq_qos for blk-mq queue.
-	 *
-	 * Reuse ->queue_lock for protecting against other concurrent
-	 * rq_qos adding/deleting
-	 */
-	blk_mq_freeze_queue(q);
-
-	spin_lock_irq(&q->queue_lock);
-	rqos->next = q->rq_qos;
-	q->rq_qos = rqos;
-	spin_unlock_irq(&q->queue_lock);
-
-	blk_mq_unfreeze_queue(q);
-
-	if (rqos->ops->debugfs_attrs)
-		blk_mq_debugfs_register_rqos(rqos);
-}
-
-static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos)
-{
-	struct rq_qos **cur;
-
-	/*
-	 * See comment in rq_qos_add() about freezing queue & using
-	 * ->queue_lock.
-	 */
-	blk_mq_freeze_queue(q);
-
-	spin_lock_irq(&q->queue_lock);
-	for (cur = &q->rq_qos; *cur; cur = &(*cur)->next) {
-		if (*cur == rqos) {
-			*cur = rqos->next;
-			break;
-		}
-	}
-	spin_unlock_irq(&q->queue_lock);
-
-	blk_mq_unfreeze_queue(q);
-
-	blk_mq_debugfs_unregister_rqos(rqos);
-}
-
 int rq_qos_register(struct rq_qos_ops *ops);
 void rq_qos_unregister(struct rq_qos_ops *ops);
 void rq_qos_activate(struct request_queue *q,
-- 
2.17.1