[$] File-level integrity

At the 2018 Linux Storage, Filesystem, and Memory Management Summit, TedTs'o introduced an integrity feature akin to dm-verity that targets Android,at least to start with. It is meant to protect the integrity of files onthe system so that any tampering would be detectable. Theinitial use case would be for a certain special type of Android file, but othersystems may find uses for it as well.