block: cleanup hd_struct freeing

Move hd_ref_init out of line as there it isn't anywhere near a fast path,
and rename the rcu ref freeing callbacks to be more descriptive.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/blk.h

@@ -389,7 +389,6 @@ char *disk_name(struct gendisk *hd, int partno, char *buf);
 #define ADDPART_FLAG_NONE	0
 #define ADDPART_FLAG_RAID	1
 #define ADDPART_FLAG_WHOLEDISK	2
-void __delete_partition(struct percpu_ref *ref);
 void delete_partition(struct gendisk *disk, struct hd_struct *part);
 int bdev_add_partition(struct block_device *bdev, int partno,
 		sector_t start, sector_t length);
@@ -397,14 +396,7 @@ int bdev_del_partition(struct block_device *bdev, int partno);
 int bdev_resize_partition(struct block_device *bdev, int partno,
 		sector_t start, sector_t length);
 int disk_expand_part_tbl(struct gendisk *disk, int target);
-
-static inline int hd_ref_init(struct hd_struct *part)
-{
-	if (percpu_ref_init(&part->ref, __delete_partition, 0,
-				GFP_KERNEL))
-		return -ENOMEM;
-	return 0;
-}
+int hd_ref_init(struct hd_struct *part);
 
 static inline void hd_struct_get(struct hd_struct *part)
 {

block/partitions/core.c

@@ -274,10 +274,10 @@ struct device_type part_type = {
 	.uevent		= part_uevent,
 };
 
-static void delete_partition_work_fn(struct work_struct *work)
+static void hd_struct_free_work(struct work_struct *work)
 {
-	struct hd_struct *part = container_of(to_rcu_work(work), struct hd_struct,
-					rcu_work);
+	struct hd_struct *part =
+		container_of(to_rcu_work(work), struct hd_struct, rcu_work);
 
 	part->start_sect = 0;
 	part->nr_sects = 0;
@@ -285,13 +285,21 @@ static void delete_partition_work_fn(struct work_struct *work)
 	put_device(part_to_dev(part));
 }
 
-void __delete_partition(struct percpu_ref *ref)
+static void hd_struct_free(struct percpu_ref *ref)
 {
 	struct hd_struct *part = container_of(ref, struct hd_struct, ref);
-	INIT_RCU_WORK(&part->rcu_work, delete_partition_work_fn);
+
+	INIT_RCU_WORK(&part->rcu_work, hd_struct_free_work);
 	queue_rcu_work(system_wq, &part->rcu_work);
 }
 
+int hd_ref_init(struct hd_struct *part)
+{
+	if (percpu_ref_init(&part->ref, hd_struct_free, 0, GFP_KERNEL))
+		return -ENOMEM;
+	return 0;
+}
+
 /*
  * Must be called either with bd_mutex held, before a disk can be opened or
  * after all disk users are gone.