ocfs2: Checksum and ECC for directory blocks.

Use the db_check field of ocfs2_dir_block_trailer to crc/ecc the
dirblocks.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index af0013b..698ef3d 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -776,7 +776,7 @@
 /*20*/	__le64		db_blkno;		/* Offset on disk, in blocks */
 	__le64		db_parent_dinode;	/* dinode which owns me, in
 						   blocks */
-/*30*/	__le64		db_check;		/* Error checking */
+/*30*/	struct ocfs2_block_check db_check;	/* Error checking */
 /*40*/
 };