ext4: fix ext4_init_block_bitmap() for metablock block group

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>

1 files changed, 1 insertions, 6 deletions

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 6dcbec9b2562..1327ac3a04de 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -121,12 +121,7 @@ unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
                                 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) {