[GFS2] Make glock operations const

For all the usual reasons of enforcing correctness and potentially
reducing code size, this patch makes the glock operations const.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/glops.h b/fs/gfs2/glops.h
index 5c1e949..9409f0a 100644
--- a/fs/gfs2/glops.h
+++ b/fs/gfs2/glops.h
@@ -10,14 +10,14 @@
 #ifndef __GLOPS_DOT_H__
 #define __GLOPS_DOT_H__
 
-extern struct gfs2_glock_operations gfs2_meta_glops;
-extern struct gfs2_glock_operations gfs2_inode_glops;
-extern struct gfs2_glock_operations gfs2_rgrp_glops;
-extern struct gfs2_glock_operations gfs2_trans_glops;
-extern struct gfs2_glock_operations gfs2_iopen_glops;
-extern struct gfs2_glock_operations gfs2_flock_glops;
-extern struct gfs2_glock_operations gfs2_nondisk_glops;
-extern struct gfs2_glock_operations gfs2_quota_glops;
-extern struct gfs2_glock_operations gfs2_journal_glops;
+extern const struct gfs2_glock_operations gfs2_meta_glops;
+extern const struct gfs2_glock_operations gfs2_inode_glops;
+extern const struct gfs2_glock_operations gfs2_rgrp_glops;
+extern const struct gfs2_glock_operations gfs2_trans_glops;
+extern const struct gfs2_glock_operations gfs2_iopen_glops;
+extern const struct gfs2_glock_operations gfs2_flock_glops;
+extern const struct gfs2_glock_operations gfs2_nondisk_glops;
+extern const struct gfs2_glock_operations gfs2_quota_glops;
+extern const struct gfs2_glock_operations gfs2_journal_glops;
 
 #endif /* __GLOPS_DOT_H__ */