[GFS2] Macros removal in gfs2.h

As suggested by Pekka Enberg <penberg@cs.helsinki.fi>.

The DIV_RU macro is renamed DIV_ROUND_UP and and moved to kernel.h
The other macros are gone from gfs2.h as (although not requested
by Pekka Enberg) are a number of included header file which are now
included individually. The inode number comparison function is
now an inline function.

The DT2IF and IF2DT may be addressed in a future patch.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c
index 4fb1704..8b22fa9 100644
--- a/fs/gfs2/util.c
+++ b/fs/gfs2/util.c
@@ -13,12 +13,16 @@
 #include <linux/completion.h>
 #include <linux/buffer_head.h>
 #include <linux/crc32.h>
+#include <linux/gfs2_ondisk.h>
 #include <asm/semaphore.h>
 #include <asm/uaccess.h>
 
 #include "gfs2.h"
+#include "lm_interface.h"
+#include "incore.h"
 #include "glock.h"
 #include "lm.h"
+#include "util.h"
 
 kmem_cache_t *gfs2_glock_cachep __read_mostly;
 kmem_cache_t *gfs2_inode_cachep __read_mostly;