[PATCH] ext4: allow larger descriptor size

make block group descriptor larger.

Signed-off-by: Alexandre Ratchov <alexandre.ratchov@bull.net>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index df77ea891f29..3dacb124b8c8 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -74,10 +74,12 @@ struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
                 return NULL;
         }
 
-        desc = (struct ext4_group_desc *) sbi->s_group_desc[group_desc]->b_data;
+        desc = (struct ext4_group_desc *)(
+                (__u8 *)sbi->s_group_desc[group_desc]->b_data +
+                offset * EXT4_DESC_SIZE(sb));
         if (bh)
                 *bh = sbi->s_group_desc[group_desc];
-        return desc + offset;
+        return desc;
 }
 
 /**