ext4: fix ext4_init_block_bitmap() for metablock block group

From: Akinobu Mita <akinobu.mita@gmail.com>

When meta_bg feature is enabled and s_first_meta_bg != 0, 
ext4_init_block_bitmap() miscalculates the number of block used by
the group descriptor table (0 or 1 for metablock block group)

This patch fixes this by using ext4_bg_num_gdb()

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Stephen Tweedie <sct@redhat.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Acked-by: Andreas Dilger <adilger@sun.com>
---
 fs/ext4/balloc.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

Index: linux-2.6.26-rc9/fs/ext4/balloc.c
===================================================================
--- linux-2.6.26-rc9.orig/fs/ext4/balloc.c	2008-07-11 16:05:04.000000000 -0700
+++ linux-2.6.26-rc9/fs/ext4/balloc.c	2008-07-11 16:05:04.000000000 -0700
@@ -121,12 +121,7 @@ unsigned ext4_init_block_bitmap(struct s
 				le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks);
 		}
 	} else { /* For META_BG_BLOCK_GROUPS */
-		int group_rel = (block_group -
-				 le32_to_cpu(sbi->s_es->s_first_meta_bg)) %
-				EXT4_DESC_PER_BLOCK(sb);
-		if (group_rel == 0 || group_rel == 1 ||
-		    (group_rel == EXT4_DESC_PER_BLOCK(sb) - 1))
-			bit_max += 1;
+		bit_max += ext4_bg_num_gdb(sb, block_group);
 	}
 
 	if (block_group == sbi->s_groups_count - 1) {