> One open question I have is what should the kernel do with 'info_type' in > response it does not understand (in the future when there are possibly more > different info types). It could just skip it because this should be just > additional info for introspection (the only mandatory part is in > fanotify_response, however it could surprise userspace that passed info is > just getting ignored. To solve this we would have to somewhere report > supported info types (maybe in fanotify fdinfo in proc). I guess we'll > cross that bridge when we get to it. > > Amir, what do you think? Regardless if and how we provide a way to enumerate supported info types, I would prefer to reject (EINVAL) unknown info types. We can provide a command FAN_RESPONSE_TEST to write a test response with FAN_NOFD and some extra info so the program can test if certain info types are supported. Thanks, Amir.
