Re: [RFC PATCH v3 09/11] xfs: Implement RWF_NOSERIAL to parallelize RWF_WRITETHROUGH writes

[Ojaswin Mujoo]

On Mon, Aug 17, 2026 at 03:33:06PM +0200, Pankaj Raghav (Samsung) wrote:
> >  	}
> >  
> > +	/*
> > +	 * Writethrough implies non-serial writes ie writes can go
> > +	 * parallelly.
> > +	 */
> > +	if (flags & RWF_WRITETHROUGH)
> > +		kiocb_flags |= IOCB_NOSERIAL;
> > +
> 
> From a user perspective, shouldn't this be an explicit user flag instead
> of implicitly enabling for all RWF_WRITETHROUGH?
> 
> Power users who would want performance over POSIX compliance can enable
> this but it should not be the other way around IMO.
> 
> --
> Pankaj

Hi Pankaj,

Yes I think we just wanted to float the idea of such a flag but I was
unsure right now whether to have users pass it or enable it implicitly.

Thinking about it again I think I agree that we can allow users to pass
it even if we just reject it for all cases except writethrough (for
now).

Regards,
ojaswin