[$] Fanotify and hierarchical storage management

In the filesystem track of the2023 Linux Storage, Filesystem,Memory-Management and BPF Summit, Amir Goldstein led a session on usingfanotifyfor hierarchicalstorage management (HSM). Linux had some support for HSM in the XFSfilesystem's implementation of the data management API (DMAPI),but that code was removedback in 2010. Goldstein has done some work on using fanotify for HSM features, but he has run into some problems withdeadlocks that he wanted to discuss with attendees.