[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>

fs/gfs2/sys.c

@@ -14,15 +14,19 @@
 #include <linux/buffer_head.h>
 #include <linux/module.h>
 #include <linux/kobject.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 "lm.h"
 #include "sys.h"
 #include "super.h"
 #include "glock.h"
 #include "quota.h"
+#include "util.h"
 
 char *gfs2_sys_margs;
 spinlock_t gfs2_sys_margs_lock;