[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/incore.h b/fs/gfs2/incore.h
index 0e550e8..2443e9a 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -313,6 +313,14 @@
 	QDF_LOCKED		= 2,
 };
 
+struct gfs2_quota_lvb {
+        uint32_t qb_magic;
+        uint32_t __pad;
+        uint64_t qb_limit;      /* Hard limit of # blocks to alloc */
+        uint64_t qb_warn;       /* Warn user when alloc is above this # */
+        int64_t qb_value;       /* Current # blocks allocated */
+};
+
 struct gfs2_quota_data {
 	struct list_head qd_list;
 	unsigned int qd_count;