A lot of applications and databases do this themselves. Part of the problem is that the app might know what the proper checksum is and it would be nice to be a

A lot of applications and databases do this themselves. Part of the problem is that the app might know what the proper checksum is and it would be nice to be able to write a document ahead of time and tell the FS that you already know the checksum. Won't save a massive amount of CPU but it would be worth it if it was easy to implement.