gfs2: Invalid security labels of inodes when they go invalid

When gfs2 releases the glock of an inode, it must invalidate all
information cached for that inode, including the page cache and acls.
Use the new security_inode_invalidate_secctx hook to also invalidate
security labels in that case.  These items will be reread from disk
when needed after reacquiring the glock.
Signed-off-by: NAndreas Gruenbacher <agruenba@redhat.com>
Acked-by: NBob Peterson <rpeterso@redhat.com>
Acked-by: NSteven Whitehouse <swhiteho@redhat.com>
Cc: cluster-devel@redhat.com
[PM: fixed spelling errors and description line lengths]
Signed-off-by: NPaul Moore <pmoore@redhat.com>

fs/gfs2/glops.c

@@ -13,6 +13,7 @@
 #include <linux/gfs2_ondisk.h>
 #include <linux/bio.h>
 #include <linux/posix_acl.h>
+#include <linux/security.h>
 
 #include "gfs2.h"
 #include "incore.h"
@@ -262,6 +263,7 @@ static void inode_go_inval(struct gfs2_glock *gl, int flags)
 		if (ip) {
 			set_bit(GIF_INVALID, &ip->i_flags);
 			forget_all_cached_acls(&ip->i_inode);
+			security_inode_invalidate_secctx(&ip->i_inode);
 			gfs2_dir_hash_inval(ip);
 		}
 	}