rbd: move rbd_dev_refresh() definition

Move rbd_dev_refresh() definition further down to avoid having to
move struct parent_image_info definition in the next commit.  This
spares some forward declarations too.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Dongsheng Yang <dongsheng.yang@easystack.cn>

Author: idryomov

drivers/block/rbd.c

@@ -633,8 +633,6 @@ static void rbd_dev_remove_parent(struct rbd_device *rbd_dev);
 
 static int rbd_dev_refresh(struct rbd_device *rbd_dev);
 static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev);
-static int rbd_dev_header_info(struct rbd_device *rbd_dev);
-static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev);
 static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev,
 					u64 snap_id);
 static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
@@ -4931,39 +4929,6 @@ static void rbd_dev_update_size(struct rbd_device *rbd_dev)
 	}
 }
 
-static int rbd_dev_refresh(struct rbd_device *rbd_dev)
-{
-	u64 mapping_size;
-	int ret;
-
-	down_write(&rbd_dev->header_rwsem);
-	mapping_size = rbd_dev->mapping.size;
-
-	ret = rbd_dev_header_info(rbd_dev);
-	if (ret)
-		goto out;
-
-	/*
-	 * If there is a parent, see if it has disappeared due to the
-	 * mapped image getting flattened.
-	 */
-	if (rbd_dev->parent) {
-		ret = rbd_dev_v2_parent_info(rbd_dev);
-		if (ret)
-			goto out;
-	}
-
-	rbd_assert(!rbd_is_snap(rbd_dev));
-	rbd_dev->mapping.size = rbd_dev->header.image_size;
-
-out:
-	up_write(&rbd_dev->header_rwsem);
-	if (!ret && mapping_size != rbd_dev->mapping.size)
-		rbd_dev_update_size(rbd_dev);
-
-	return ret;
-}
-
 static const struct blk_mq_ops rbd_mq_ops = {
 	.queue_rq	= rbd_queue_rq,
 };
@@ -7043,6 +7008,39 @@ static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth)
 	return ret;
 }
 
+static int rbd_dev_refresh(struct rbd_device *rbd_dev)
+{
+	u64 mapping_size;
+	int ret;
+
+	down_write(&rbd_dev->header_rwsem);
+	mapping_size = rbd_dev->mapping.size;
+
+	ret = rbd_dev_header_info(rbd_dev);
+	if (ret)
+		goto out;
+
+	/*
+	 * If there is a parent, see if it has disappeared due to the
+	 * mapped image getting flattened.
+	 */
+	if (rbd_dev->parent) {
+		ret = rbd_dev_v2_parent_info(rbd_dev);
+		if (ret)
+			goto out;
+	}
+
+	rbd_assert(!rbd_is_snap(rbd_dev));
+	rbd_dev->mapping.size = rbd_dev->header.image_size;
+
+out:
+	up_write(&rbd_dev->header_rwsem);
+	if (!ret && mapping_size != rbd_dev->mapping.size)
+		rbd_dev_update_size(rbd_dev);
+
+	return ret;
+}
+
 static ssize_t do_rbd_add(const char *buf, size_t count)
 {
 	struct rbd_device *rbd_dev = NULL;