[$] An update on torn-write protection

In a combined storage and filesystem track session at the
2025 Linux Storage, Filesystem, Memory Management, and BPF Summit, John
Garry continued the theme of 'untorn' (or atomic) writes that started in the previous session. It was also
an update on where things have gone for untorn writes since his session at last year's summit. Beyond that,
he looked at some of the plans and challenges for the feature in the future.