[$] A setback for fs-verity

The fs-verity mechanism, created to protectfiles on Android devices from hostile modification by attackers, seemed tobe on track for inclusion into the mainline kernel during the current mergewindow when thepatch set was posted at the beginning of November. Indeed, it wasn'tuntil mid-December that some other developers started to raise objections.The resulting conversation has revealed a deep difference of opinion regardingwhat makes a good filesystem-related API and may have implications for howsimilar features are implemented in the future.