btrfs: factor out sysfs code for sending device uevent

The device uevent belongs to the sysfs API.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/sysfs.c

@@ -913,6 +913,17 @@ int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
 	return error;
 }
 
+void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action)
+{
+	int ret;
+
+	ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
+	if (ret)
+		pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
+			action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
+			&disk_to_dev(bdev->bd_disk)->kobj);
+}
+
 /* /sys/fs/btrfs/ entry */
 static struct kset *btrfs_kset;
 

fs/btrfs/sysfs.h

@@ -89,6 +89,7 @@ int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs);
 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs);
 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
 		u64 bit, enum btrfs_feature_set set);
+void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action);
 
 int __init btrfs_init_sysfs(void);
 void __cold btrfs_exit_sysfs(void);

fs/btrfs/volumes.c

@@ -358,19 +358,6 @@ static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
 	kfree(fs_devices);
 }
 
-static void btrfs_kobject_uevent(struct block_device *bdev,
-				 enum kobject_action action)
-{
-	int ret;
-
-	ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
-	if (ret)
-		pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
-			action,
-			kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
-			&disk_to_dev(bdev->bd_disk)->kobj);
-}
-
 void __exit btrfs_cleanup_fs_uuids(void)
 {
 	struct btrfs_fs_devices *fs_devices;