[GFS2] selinux support

This adds support to GFS2 for selinux extended attributes. There is a
known bug in gfs2_ea_get() which is believed to be independant of this
patch. Further patches will follow once that bug is fixed in order to
make GFS2 use as much of the generic eattr infrastructure as possible.

Signed-off-by: Ryan O'Hara <rohara@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/include/linux/gfs2_ondisk.h b/include/linux/gfs2_ondisk.h
index 4356e38..3893aac 100644
--- a/include/linux/gfs2_ondisk.h
+++ b/include/linux/gfs2_ondisk.h
@@ -311,8 +311,9 @@
 #define GFS2_EATYPE_UNUSED	0
 #define GFS2_EATYPE_USR		1
 #define GFS2_EATYPE_SYS		2
+#define GFS2_EATYPE_SECURITY	3
 
-#define GFS2_EATYPE_LAST	2
+#define GFS2_EATYPE_LAST	3
 #define GFS2_EATYPE_VALID(x)	((x) <= GFS2_EATYPE_LAST)
 
 #define GFS2_EAFLAG_LAST	0x01	/* last ea in block */