[PATCH RFC v2 3/7] block: export some API

[Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

These APIs are used in iocost, prepare to build iocost as kernel module.

Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
 block/blk-cgroup.c | 4 ++++
 block/blk-rq-qos.c | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 4da70fc7775e..787e3023a366 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -57,6 +57,7 @@ static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS];
 static LIST_HEAD(all_blkcgs);		/* protected by blkcg_pol_mutex */
 
 bool blkcg_debug_stats = false;
+EXPORT_SYMBOL_GPL(blkcg_debug_stats);
 
 static DEFINE_RAW_SPINLOCK(blkg_stat_lock);
 
@@ -688,6 +689,7 @@ const char *blkg_dev_name(struct blkcg_gq *blkg)
 		return NULL;
 	return bdi_dev_name(blkg->q->disk->bdi);
 }
+EXPORT_SYMBOL_GPL(blkg_dev_name);
 
 /**
  * blkcg_print_blkgs - helper for printing per-blkg data
@@ -815,6 +817,7 @@ int blkg_conf_open_bdev(struct blkg_conf_ctx *ctx)
 	ctx->bdev = bdev;
 	return 0;
 }
+EXPORT_SYMBOL_GPL(blkg_conf_open_bdev);
 
 /**
  * blkg_conf_prep - parse and prepare for per-blkg config update
@@ -2011,6 +2014,7 @@ void blkcg_schedule_throttle(struct gendisk *disk, bool use_memdelay)
 		current->use_memdelay = use_memdelay;
 	set_notify_resume(current);
 }
+EXPORT_SYMBOL_GPL(blkcg_schedule_throttle);
 
 /**
  * blkcg_add_delay - add delay to this blkg
diff --git a/block/blk-rq-qos.c b/block/blk-rq-qos.c
index dd7310c94713..c3fdf91ddf8d 100644
--- a/block/blk-rq-qos.c
+++ b/block/blk-rq-qos.c
@@ -332,6 +332,7 @@ int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
 	blk_mq_unfreeze_queue(q);
 	return -EBUSY;
 }
+EXPORT_SYMBOL_GPL(rq_qos_add);
 
 void rq_qos_del(struct rq_qos *rqos)
 {
@@ -353,3 +354,4 @@ void rq_qos_del(struct rq_qos *rqos)
 	blk_mq_debugfs_unregister_rqos(rqos);
 	mutex_unlock(&q->debugfs_mutex);
 }
+EXPORT_SYMBOL_GPL(rq_qos_del);
-- 
2.39.2