Re: [PATCH 0/6] NFSD: add enable-dontcache and initially use it to add DIO support

Christoph Hellwig
2025-06-13T05:31:16Z

On Thu, Jun 12, 2025 at 04:37:22PM -0400, Mike Snitzer wrote:
> On Thu, Jun 12, 2025 at 12:39:44AM -0700, Christoph Hellwig wrote:
> >
> > Another thing is that using the page cache for reads is probably
> > rather pointless. I've been wondering if we should just change
> > the direct I/O read code to read from the page cache if there are
> > cached pages and otherwise go direct to the device. That would make
> > a setup using buffered writes (without or without the dontcache
> > flag) and direct I/O reads safe.
>
> Yes, that sounds like a good idea. Just an idea at this point or have
> you tried to implement it?

Just an idea.

> FYI, I mentioned this earlier at one point in this thread but I was
> thinking the IOR "hard"

Sorry, but what is IOR?