On Sat, Jan 18, 2025 at 09:19:15AM +1100, Dave Chinner wrote: > And, quite frankly, the fact the bcachefs solution also covers AIO > DIO in flight (which i_rwsem based locking does not!) means it is a > more robust solution than trying to rely on racy i_dio_count hacks > and folio residency in the page cache... The original i_rwsem (still i_iolock then) scheme did that, but the core locking maintainers asked us to remove the non-owner unlocks, so I did that. It turns out later we got officially sanctioned non-owner unlocks, so we could have easily add this back. I did that 5 years ago, but reception was lukewarm: http://git.infradead.org/?p=users/hch/xfs.git;a=shortlog;h=refs/heads/i_rwsem-non_owner
