need help on Storage EXT4 journal in enhanced area of eMMC

Hi All, I find that in Linaro 13.07 Release With Linux Kernel 3.10.1 There is a feature ��Storage EXT4 journal in enhanced area of eMMC �C Club journal and metadata together in enhanced area��. But I did not find any code about it. Can anyone help me?

Thanks Peter Pan EBU APAC System Engineering Tel: 86-021-38997413 Mobile: 86-18516211455 Email: peterpandong@micron.com Address: No 601 Fasai Rd, Pudong, Shanghai, China, 200131