Re: [PATCH 2/2] block: take i_rwsem for the direct I/O write fallback

[Christoph Hellwig]

On Sun, Aug 02, 2026 at 08:11:41PM +0300, Tal Zussman wrote:
> >  	} else {
> >  		/*
> >  		 * Take i_rwsem and invalidate_lock to avoid racing with
> > 
> 
> I seem to have stumbled into a Sashiko rabbit hole of issues with IOCB_NOWAIT
> and IOCB_ATOMIC here... [1].
> I'll wait a day or two and send an update along with some additional fixes
> I've spotted.

I think IOCB_ATOMIC vs fallback to buffered I/O is a generally
unsolved issue.  I know ext4 just has a warning, but I'm not
sure how to avoid creating the problem in the first place.