Fanotify access permission event for all files in a directory

Question

I want to get notify for each time a file is accessed in a certain directory using fanotify. I'm familiar with fanotify and generally know how to do it, my problem is with fanotify_mark function and what flags and mask should I use for this? I must use FAN_ACCESS_PERM flag for permission events, and probably FAN_MARK_ADD mask. what other masks should I use? I think it's documentation is very bad and not clear at all.

Answer 1

Fanotify isn't recursive. It only works that way when working on mounted directories.

then in code:

fanotify_mark(fd,
      FAN_MARK_ADD | FAN_MARK_MOUNT,
      FAN_ACCESS_PERM | FAN_EVENT_ON_CHILD,
      AT_FDCWD, "/your-directory")

All access events on the same mountpoint of /your-directory will be notified.