Use new fanotify Linux API in FileSystemWatcher

[MarcusWichelmann]

Currently the FileSystemWatcher implementation for Linux is based on the inotify kernel API which is very inefficient and has some strong limitations.
But there is this new kernel API called fanotify with some advantages like being able to watch large directory trees recursively.

Do you have any plans using this API in the FileSystemWatcher when it's available? For older kernels, a fallback to inotify would probably still be necessary.

[stephentoub]

We don't currently have any such plans. We always welcome improvements, though, provided they actually are ;)

[wfurt]

https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.1-Fanotify-Improvements

The current inotify API cannot monitor directory tree so we create new watcher for each level with inherent possibility to miss events.

We should probably let it stabilize and proof its worth.

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