re-enable IOCB_NOWAIT writes to files v4

[Christian Brauner]

On Wed, Jan 07, 2026 at 08:32:47AM +0100, Christoph Hellwig wrote:
> On Tue, Jan 06, 2026 at 10:43:49PM +0100, Christian Brauner wrote:
> > > Umm, as in my self reply just before heading out for vacation, Julia
> > > found issues in it using static type checking tools.  I have a new
> > > version that fixes that and sorts out the S_* mess.  So please drop
> > > it again for now, I'll resend the fixed version ASAP.
> > 
> > It has never been pushed nor applied as I saw your mail right before all
> > of that.
> 
> Thanks.  But maybe you can fix up the applied messages to be more
> specific?  We had various issues in the past with them, where they
> were sent, but things did not end up in the tree for various reasons.

What are you thinking of exactly?