blk-cgroup: pass a gendisk to blkcg_{de,}activate_policy

Prepare for storing the blkcg information in the gendisk instead of
the request_queue.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Andreas Herrmann <aherrmann@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20230203150400.3199230-17-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/bfq-cgroup.c

@@ -1291,7 +1291,7 @@ struct bfq_group *bfq_create_group_hierarchy(struct bfq_data *bfqd, int node)
 {
 	int ret;
 
-	ret = blkcg_activate_policy(bfqd->queue, &blkcg_policy_bfq);
+	ret = blkcg_activate_policy(bfqd->queue->disk, &blkcg_policy_bfq);
 	if (ret)
 		return NULL;
 

block/bfq-iosched.c

@@ -7146,7 +7146,7 @@ static void bfq_exit_queue(struct elevator_queue *e)
 	bfqg_and_blkg_put(bfqd->root_group);
 
 #ifdef CONFIG_BFQ_GROUP_IOSCHED
-	blkcg_deactivate_policy(bfqd->queue, &blkcg_policy_bfq);
+	blkcg_deactivate_policy(bfqd->queue->disk, &blkcg_policy_bfq);
 #else
 	spin_lock_irq(&bfqd->lock);
 	bfq_put_async_queues(bfqd, bfqd->root_group);

block/blk-cgroup.c

@@ -1390,14 +1390,14 @@ struct cgroup_subsys io_cgrp_subsys = {
 EXPORT_SYMBOL_GPL(io_cgrp_subsys);
 
 /**
- * blkcg_activate_policy - activate a blkcg policy on a request_queue
- * @q: request_queue of interest
+ * blkcg_activate_policy - activate a blkcg policy on a gendisk
+ * @disk: gendisk of interest
  * @pol: blkcg policy to activate
  *
- * Activate @pol on @q.  Requires %GFP_KERNEL context.  @q goes through
+ * Activate @pol on @disk.  Requires %GFP_KERNEL context.  @disk goes through
  * bypass mode to populate its blkgs with policy_data for @pol.
  *
- * Activation happens with @q bypassed, so nobody would be accessing blkgs
+ * Activation happens with @disk bypassed, so nobody would be accessing blkgs
  * from IO path.  Update of each blkg is protected by both queue and blkcg
  * locks so that holding either lock and testing blkcg_policy_enabled() is
  * always enough for dereferencing policy data.
@@ -1405,9 +1405,9 @@ EXPORT_SYMBOL_GPL(io_cgrp_subsys);
  * The caller is responsible for synchronizing [de]activations and policy
  * [un]registerations.  Returns 0 on success, -errno on failure.
  */
-int blkcg_activate_policy(struct request_queue *q,
-			  const struct blkcg_policy *pol)
+int blkcg_activate_policy(struct gendisk *disk, const struct blkcg_policy *pol)
 {
+	struct request_queue *q = disk->queue;
 	struct blkg_policy_data *pd_prealloc = NULL;
 	struct blkcg_gq *blkg, *pinned_blkg = NULL;
 	int ret;
@@ -1508,16 +1508,17 @@ int blkcg_activate_policy(struct request_queue *q,
 EXPORT_SYMBOL_GPL(blkcg_activate_policy);
 
 /**
- * blkcg_deactivate_policy - deactivate a blkcg policy on a request_queue
- * @q: request_queue of interest
+ * blkcg_deactivate_policy - deactivate a blkcg policy on a gendisk
+ * @disk: gendisk of interest
  * @pol: blkcg policy to deactivate
  *
- * Deactivate @pol on @q.  Follows the same synchronization rules as
+ * Deactivate @pol on @disk.  Follows the same synchronization rules as
  * blkcg_activate_policy().
  */
-void blkcg_deactivate_policy(struct request_queue *q,
+void blkcg_deactivate_policy(struct gendisk *disk,
 			     const struct blkcg_policy *pol)
 {
+	struct request_queue *q = disk->queue;
 	struct blkcg_gq *blkg;
 
 	if (!blkcg_policy_enabled(q, pol))

block/blk-cgroup.h

@@ -194,9 +194,8 @@ void blkcg_exit_disk(struct gendisk *disk);
 /* Blkio controller policy registration */
 int blkcg_policy_register(struct blkcg_policy *pol);
 void blkcg_policy_unregister(struct blkcg_policy *pol);
-int blkcg_activate_policy(struct request_queue *q,
-			  const struct blkcg_policy *pol);
-void blkcg_deactivate_policy(struct request_queue *q,
+int blkcg_activate_policy(struct gendisk *disk, const struct blkcg_policy *pol);
+void blkcg_deactivate_policy(struct gendisk *disk,
 			     const struct blkcg_policy *pol);
 
 const char *blkg_dev_name(struct blkcg_gq *blkg);
@@ -495,9 +494,9 @@ static inline int blkcg_init_disk(struct gendisk *disk) { return 0; }
 static inline void blkcg_exit_disk(struct gendisk *disk) { }
 static inline int blkcg_policy_register(struct blkcg_policy *pol) { return 0; }
 static inline void blkcg_policy_unregister(struct blkcg_policy *pol) { }
-static inline int blkcg_activate_policy(struct request_queue *q,
+static inline int blkcg_activate_policy(struct gendisk *disk,
 					const struct blkcg_policy *pol) { return 0; }
-static inline void blkcg_deactivate_policy(struct request_queue *q,
+static inline void blkcg_deactivate_policy(struct gendisk *disk,
 					   const struct blkcg_policy *pol) { }
 
 static inline struct blkg_policy_data *blkg_to_pd(struct blkcg_gq *blkg,

block/blk-iocost.c

@@ -2821,7 +2821,7 @@ static void ioc_rqos_exit(struct rq_qos *rqos)
 {
 	struct ioc *ioc = rqos_to_ioc(rqos);
 
-	blkcg_deactivate_policy(rqos->disk->queue, &blkcg_policy_iocost);
+	blkcg_deactivate_policy(rqos->disk, &blkcg_policy_iocost);
 
 	spin_lock_irq(&ioc->lock);
 	ioc->running = IOC_STOP;
@@ -2893,7 +2893,7 @@ static int blk_iocost_init(struct gendisk *disk)
 	if (ret)
 		goto err_free_ioc;
 
-	ret = blkcg_activate_policy(disk->queue, &blkcg_policy_iocost);
+	ret = blkcg_activate_policy(disk, &blkcg_policy_iocost);
 	if (ret)
 		goto err_del_qos;
 	return 0;

block/blk-iolatency.c

@@ -646,7 +646,7 @@ static void blkcg_iolatency_exit(struct rq_qos *rqos)
 
 	timer_shutdown_sync(&blkiolat->timer);
 	flush_work(&blkiolat->enable_work);
-	blkcg_deactivate_policy(rqos->disk->queue, &blkcg_policy_iolatency);
+	blkcg_deactivate_policy(rqos->disk, &blkcg_policy_iolatency);
 	kfree(blkiolat);
 }
 
@@ -768,7 +768,7 @@ int blk_iolatency_init(struct gendisk *disk)
 			 &blkcg_iolatency_ops);
 	if (ret)
 		goto err_free;
-	ret = blkcg_activate_policy(disk->queue, &blkcg_policy_iolatency);
+	ret = blkcg_activate_policy(disk, &blkcg_policy_iolatency);
 	if (ret)
 		goto err_qos_del;
 

block/blk-ioprio.c

@@ -204,12 +204,12 @@ void blkcg_set_ioprio(struct bio *bio)
 
 void blk_ioprio_exit(struct gendisk *disk)
 {
-	blkcg_deactivate_policy(disk->queue, &ioprio_policy);
+	blkcg_deactivate_policy(disk, &ioprio_policy);
 }
 
 int blk_ioprio_init(struct gendisk *disk)
 {
-	return blkcg_activate_policy(disk->queue, &ioprio_policy);
+	return blkcg_activate_policy(disk, &ioprio_policy);
 }
 
 static int __init ioprio_init(void)

block/blk-throttle.c

@@ -2395,7 +2395,7 @@ int blk_throtl_init(struct gendisk *disk)
 	td->low_downgrade_time = jiffies;
 
 	/* activate policy */
-	ret = blkcg_activate_policy(q, &blkcg_policy_throtl);
+	ret = blkcg_activate_policy(disk, &blkcg_policy_throtl);
 	if (ret) {
 		free_percpu(td->latency_buckets[READ]);
 		free_percpu(td->latency_buckets[WRITE]);
@@ -2411,7 +2411,7 @@ void blk_throtl_exit(struct gendisk *disk)
 	BUG_ON(!q->td);
 	del_timer_sync(&q->td->service_queue.pending_timer);
 	throtl_shutdown_wq(q);
-	blkcg_deactivate_policy(q, &blkcg_policy_throtl);
+	blkcg_deactivate_policy(disk, &blkcg_policy_throtl);
 	free_percpu(q->td->latency_buckets[READ]);
 	free_percpu(q->td->latency_buckets[WRITE]);
 	kfree(q->td);