[linux-kernel] Dual license with GPLv2

contrib/linux-kernel/fs/btrfs/zstd.c

@@ -1,3 +1,21 @@
+/*
+ * Copyright (c) 2016-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>

contrib/linux-kernel/fs/squashfs/zstd_wrapper.c

@@ -1,7 +1,8 @@
 /*
  * Squashfs - a compressed read only filesystem for Linux
  *
- * Copyright (c) 2017 Facebook
+ * Copyright (c) 2016-present, Facebook, Inc.
+ * All rights reserved.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License