[$] Handling the NFS change attribute

The saga of the i_version field for inodes, which tracks theoccurrence of changesto the data or metadata of a file, continued in a discussion at the 2024 Linux Storage,Filesystem, Memory Management, and BPF Summit. In a session led byJeff Layton, who has been doing a lot the work on changing the semantics and functioning ofi_version over the years, he updated attendees on the status of the effort since a session at last year's summit. His summarywas that things are"pretty much where we started last year", but the discussion this timepointed to some possible ways forward.