sys/fs: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

sys/fs/cd9660/cd9660_iconv.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2003 Ryuichiro Imura
  * All rights reserved.
  *

sys/fs/devfs/devfs.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
  * Copyright (c) 2000

sys/fs/devfs/devfs_devs.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2000,2004
  *	Poul-Henning Kamp.  All rights reserved.
  *

sys/fs/devfs/devfs_dir.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010 Jaakko Heinonen <[email protected]>
  * All rights reserved.
  *

sys/fs/devfs/devfs_int.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2005 Poul-Henning Kamp.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without

sys/fs/devfs/devfs_rule.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2002 Dima Dorfman.
  * All rights reserved.
  *

sys/fs/devfs/devfs_vfsops.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 1992, 1993, 1995
  *	The Regents of the University of California.  All rights reserved.
  * Copyright (c) 2000

sys/fs/devfs/devfs_vnops.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2000-2004
  *	Poul-Henning Kamp.  All rights reserved.
  * Copyright (c) 1989, 1992-1993, 1995

sys/fs/ext2fs/ext2_dinode.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Aditya Sarawgi
  * All rights reserved.
  *

sys/fs/ext2fs/ext2_dir.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Aditya Sarawgi
  * All rights reserved.
  *

sys/fs/ext2fs/ext2_extents.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010 Zheng Liu <[email protected]>
  * All rights reserved.
  *

sys/fs/ext2fs/ext2_extents.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2012, 2010 Zheng Liu <[email protected]>
  * All rights reserved.
  *

sys/fs/ext2fs/ext2_hash.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010, 2013 Zheng Liu <[email protected]>
  * Copyright (c) 2012, Vyacheslav Matyushin
  * All rights reserved.

sys/fs/ext2fs/ext2_htree.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010, 2012 Zheng Liu <[email protected]>
  * Copyright (c) 2012, Vyacheslav Matyushin
  * All rights reserved.

sys/fs/ext2fs/ext2fs.h

@@ -7,6 +7,8 @@
  * $FreeBSD$
  */
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Aditya Sarawgi
  * All rights reserved.
  *

sys/fs/ext2fs/htree.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010, 2012 Zheng Liu <[email protected]>
  * Copyright (c) 2012, Vyacheslav Matyushin
  * All rights reserved.

sys/fs/msdosfs/denode.h

@@ -2,6 +2,8 @@
 /*	$NetBSD: denode.h,v 1.25 1997/11/17 15:36:28 ws Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
  * All rights reserved.

sys/fs/msdosfs/direntry.h

@@ -2,6 +2,8 @@
 /*	$NetBSD: direntry.h,v 1.14 1997/11/17 15:36:32 ws Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
  * All rights reserved.

sys/fs/msdosfs/fat.h

@@ -2,6 +2,8 @@
 /*	$NetBSD: fat.h,v 1.12 1997/11/17 15:36:36 ws Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (C) 1994, 1997 Wolfgang Solfrank.
  * Copyright (C) 1994, 1997 TooLs GmbH.
  * All rights reserved.

sys/fs/msdosfs/msdosfs_conv.c

@@ -2,6 +2,8 @@
 /*	$NetBSD: msdosfs_conv.c,v 1.25 1997/11/17 15:36:40 ws Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (C) 1995, 1997 Wolfgang Solfrank.
  * Copyright (C) 1995, 1997 TooLs GmbH.
  * All rights reserved.

sys/fs/msdosfs/msdosfs_denode.c

@@ -2,6 +2,8 @@
 /*	$NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
  * All rights reserved.

sys/fs/msdosfs/msdosfs_fat.c

@@ -2,6 +2,8 @@
 /*	$NetBSD: msdosfs_fat.c,v 1.28 1997/11/17 15:36:49 ws Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
  * All rights reserved.

sys/fs/msdosfs/msdosfs_iconv.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2003 Ryuichiro Imura
  * All rights reserved.
  *

sys/fs/msdosfs/msdosfs_lookup.c

@@ -2,6 +2,8 @@
 /*	$NetBSD: msdosfs_lookup.c,v 1.37 1997/11/17 15:36:54 ws Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
  * All rights reserved.

sys/fs/msdosfs/msdosfs_vfsops.c

@@ -2,6 +2,8 @@
 /*	$NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
  * All rights reserved.

sys/fs/msdosfs/msdosfs_vnops.c

@@ -2,6 +2,8 @@
 /*	$NetBSD: msdosfs_vnops.c,v 1.68 1998/02/10 14:10:04 mrg Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
  * All rights reserved.

sys/fs/msdosfs/msdosfsmount.h

@@ -2,6 +2,8 @@
 /*	$NetBSD: msdosfsmount.h,v 1.17 1997/11/17 15:37:07 ws Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
  * All rights reserved.

sys/fs/nandfs/bmap.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2012 Semihalf
  * All rights reserved.
  *

sys/fs/nandfs/bmap.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2012 Semihalf
  * All rights reserved.
  * 

sys/fs/nandfs/nandfs.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf
  * Copyright (c) 2008, 2009 Reinoud Zandijk
  * All rights reserved.

sys/fs/nandfs/nandfs_alloc.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf.
  * All rights reserved.
  *

sys/fs/nandfs/nandfs_bmap.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf
  * Copyright (c) 2008, 2009 Reinoud Zandijk
  * All rights reserved.

sys/fs/nandfs/nandfs_buffer.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf.
  * All rights reserved.
  *

sys/fs/nandfs/nandfs_cleaner.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf.
  * All rights reserved.
  *

sys/fs/nandfs/nandfs_cpfile.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf.
  * All rights reserved.
  *

sys/fs/nandfs/nandfs_dat.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf.
  * All rights reserved.
  *

sys/fs/nandfs/nandfs_dir.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf
  * Copyright (c) 2008, 2009 Reinoud Zandijk
  * All rights reserved.

sys/fs/nandfs/nandfs_fs.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf
  * Copyright (c) 2008, 2009 Reinoud Zandijk
  * All rights reserved.

sys/fs/nandfs/nandfs_ifile.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf.
  * All rights reserved.
  *

sys/fs/nandfs/nandfs_mount.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 2008, 2009 Reinoud Zandijk
  * All rights reserved.
  *

sys/fs/nandfs/nandfs_segment.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf.
  * All rights reserved.
  *

sys/fs/nandfs/nandfs_subr.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf
  * Copyright (c) 2008, 2009 Reinoud Zandijk
  * All rights reserved.

sys/fs/nandfs/nandfs_subr.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf
  * Copyright (c) 2008, 2009 Reinoud Zandijk
  * All rights reserved.

sys/fs/nandfs/nandfs_sufile.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf.
  * All rights reserved.
  *

sys/fs/nandfs/nandfs_vfsops.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf
  * Copyright (c) 2008, 2009 Reinoud Zandijk
  * All rights reserved.

sys/fs/nandfs/nandfs_vnops.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2010-2012 Semihalf
  * Copyright (c) 2008, 2009 Reinoud Zandijk
  * All rights reserved.

sys/fs/nfs/nfs_commonacl.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Rick Macklem, University of Guelph
  * All rights reserved.
  *

sys/fs/nfs/nfscl.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Rick Macklem, University of Guelph
  * All rights reserved.
  *

sys/fs/nfs/nfsclstate.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Rick Macklem, University of Guelph
  * All rights reserved.
  *

sys/fs/nfs/nfsdport.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Rick Macklem, University of Guelph
  * All rights reserved.
  *

sys/fs/nfs/nfskpiport.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Rick Macklem, University of Guelph
  * All rights reserved.
  *

sys/fs/nfs/nfsrvstate.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Rick Macklem, University of Guelph
  * All rights reserved.
  *

sys/fs/nfs/nfsv4_errstr.h

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Rick Macklem, University of Guelph
  * All rights reserved.
  *

sys/fs/nfsclient/nfs_clkdtrace.c

@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Robert N. M. Watson
  * All rights reserved.
  *