btrfs: code optimize: BTRFS_ATTR_RW could set the mode

BTRFS_ATTR_RW could set the mode and be inline with BTRFS_ATTR
Signed-off-by: NAnand Jain <anand.jain@oracle.com>
Signed-off-by: NChris Mason <clm@fb.com>

fs/btrfs/sysfs.c

@@ -401,7 +401,7 @@ static ssize_t btrfs_label_store(struct kobject *kobj,
 
 	return ret;
 }
-BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store);
+BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store);
 
 static ssize_t btrfs_nodesize_show(struct kobject *kobj,
 				struct kobj_attribute *a, char *buf)

fs/btrfs/sysfs.h

@@ -20,12 +20,13 @@ enum btrfs_feature_set {
 	.store	= _store,						\
 }
 
-#define BTRFS_ATTR_RW(_name, _mode, _show, _store)			\
+#define BTRFS_ATTR_RW(_name, _show, _store)			\
 	static struct kobj_attribute btrfs_attr_##_name =		\
-			__INIT_KOBJ_ATTR(_name, _mode, _show, _store)
+			__INIT_KOBJ_ATTR(_name, 0644, _show, _store)
 
 #define BTRFS_ATTR(_name, _show)					\
-			BTRFS_ATTR_RW(_name, 0444, _show, NULL)
+	static struct kobj_attribute btrfs_attr_##_name =		\
+			__INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
 
 #define BTRFS_ATTR_PTR(_name)    (&btrfs_attr_##_name.attr)