ext4_inode difference between e2fsprogs and ext4

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

in e2fsprogs we have

union { 
                struct {
                        __u16   l_i_blocks_hi;
                        __u16   i_pad1;
                        __u16   l_i_uid_high;   /* these 2 fields    */
                        __u16   l_i_gid_high;   /* were reserved2[0] */
                        __u32   l_i_reserved2;
                } linux2;



In ext4 we have

  union { 
                struct {
                        __le16  l_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
                        __le16  l_i_file_acl_high;
                        __le16  l_i_uid_high;   /* these 2 fields */
                        __le16  l_i_gid_high;   /* were reserved2[0] */
                        __u32   l_i_reserved2;
                } linux2;


Last week we were discussing about taking that l_i_reserved1 and using that for making file_acl 64 bit and using the
lower l_i_reserved2 for 64 bit dir_acl. 

Now where will i put l_i_blocks_hi ?

-aneesh