> > > The code that sits in linux-next can give you pretty much a drop-in > > > replacement of inotify and nothing more. See example code: > > > https://github.com/amir73il/inotify-tools/commits/fanotify_name_fid > > > > This is really great. Thank you for doing that work this will help quite > > a lot of use-cases and make things way simpler. I created a TODO to port > > our path-hotplug to this once this feature lands. > > > > FWIW, I just tried to build this branch on Ubuntu 20.04.2 with LTS kernel > and there were some build issues, so rebased my branch on upstream > inotify-tools to fix those build issues. > > I was not aware that the inotify-tools project is alive, I never intended > to upstream this demo code and never created a github pull request > but rebasing on upstream brought in some CI scripts, when I pushed the > branch to my github it triggered some tests that reported build failures on > Ubuntu 16.04 and 18.04. > > Anyway, there is a pre-rebase branch 'fanotify_name' and the post rebase > branch 'fanotify_name_fid'. You can try whichever works for you. > > You can look at the test script src/test_demo.sh for usage example. > Or just cd into a writable directory and run the script to see the demo. > The demo determines whether to use a recursive watch or "global" > watch by the uid of the user. > > > > > > > > > If you think that is useful and you want to play with this feature I can > > > > > provide a WIP branch soon. > > > > > > > > I would like to first play with the support for unprivileged fanotify > > > > but sure, it does sound useful! > > > > > > Just so you have an idea what I am talking about, this is a very early > > > POC branch: > > > https://github.com/amir73il/linux/commits/fanotify_userns > > > > Thanks! I'll try to pull this and take a look next week. I hope that's > > ok. > > > > Fine. I'm curious to know what it does. > Did not get to test it with userns yet :) Now tested FAN_MARK_FILESYSTEM watch on tmpfs mounted inside userns and works fine, with two wrinkles I needed to iron: 1. FAN_REPORT_FID not supported on tmpfs because tmpfs has zero f_fsid (easy to fix) 2. open_by_handle_at() is not userns aware (can relax for FS_USERNS_MOUNT fs) Pushed these two fixes to branch fanotify_userns. Thanks, Amir.
