[$] Handling the NFS change attribute

The saga of the i_version field for inodes, which tracks the
occurrence of changes
to 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 by
Jeff Layton, who has been doing a lot the work on changing the semantics and functioning of
i_version over the years, he updated attendees on the status of the effort since a session at last year's summit. His summary
was that things are
'pretty much where we started last year', but the discussion this time
pointed to some possible ways forward.