How to have access control for all users, including root, for R/W regular files?

1.   I have a Linux Security Module (LSM) on RedHat ES 5, kernel 2.6.18. The LSM implements access control for all users, including root, when they Read/Write regular files.
2.   I'd like to implement the same functionality in CentOS 7, kernel 3.10.0.
3.   However, since kernel 2.6.35, LSMs are no longer supported.

Any ideas how can I achieve {2}?

CWP now has a custom security kernel which is similar to LSM but more advanced.
You would need to have a support service for this custom kernel and tool installation

http://centos-webpanel.com/support-services