fs: migrate to SPDX identifier

Most tools used for compliance and SBOM generation use SPDX identifiers
This change brings us a step closer to an easy SBOM generation.

Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>

fs/aio/CMakeLists.txt

@@ -1,6 +1,8 @@
 # ##############################################################################
 # fs/aio/CMakeLists.txt
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more contributor
 # license agreements.  See the NOTICE file distributed with this work for
 # additional information regarding copyright ownership.  The ASF licenses this

fs/aio/Make.defs

@@ -1,15 +1,17 @@
 ############################################################################
 # fs/aio/Make.defs
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more
 # contributor license agreements.  See the NOTICE file distributed with
 # this work for additional information regarding copyright ownership.  The
 # ASF licenses this file to you under the Apache License, Version 2.0 (the
 # "License"); you may not use this file except in compliance with the
 # License.  You may obtain a copy of the License at
-
+#
 #   http://www.apache.org/licenses/LICENSE-2.0
-
+#
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the

fs/aio/aio_cancel.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * fs/aio/aio_cancel.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

fs/aio/aio_fsync.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * fs/aio/aio_fsync.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

fs/aio/aio_initialize.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * fs/aio/aio_initialize.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

fs/aio/aio_queue.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * fs/aio/aio_queue.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

fs/aio/aio_read.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * fs/aio/aio_read.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

fs/aio/aio_signal.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * fs/aio/aio_signal.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

fs/aio/aio_write.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * fs/aio/aio_write.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The

fs/aio/aioc_contain.c

@@ -1,6 +1,8 @@
 /****************************************************************************
  * fs/aio/aioc_contain.c
  *
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.  The