[$] Hierarchical storage management, fanotify, FUSE, and more

Amir Goldstein led a filesystem-track session at the 2024 Linux Storage,Filesystem, Memory Management, and BPF Summit on his project to build ahierarchicalstorage management (HSM) system using fanotify.The idea is to monitor file access in order to determine when to retrievecontent from non-local storage (e.g. the cloud). The session was afollow-up to last year's introduction to theproject, which covered some of the problems he had encountered; thisyear, hewas updating attendees on its status and progress, along with some otherproblem areas that he wanted to discuss.