Re: [PATCH v2 01/31] Documentation: document EXPORT_OP_NOLOCKS

Jeff Layton
2026-01-20T13:20:14Z

On Mon, 2026-01-19 at 23:44 -0800, Christoph Hellwig wrote:
> On Mon, Jan 19, 2026 at 11:26:18AM -0500, Jeff Layton wrote:
> > + EXPORT_OP_NOLOCKS - Disable file locking on this filesystem. Some
> > + filesystems cannot properly support file locking as implemented by
> > + nfsd. A case in point is reexport of NFS itself, which can't be done
> > + safely without coordinating the grace period handling. Other clustered
> > + and networked filesystems can be problematic here as well.
>
> I'm not sure this is very useful. It really needs to document what
> locking semantics nfs expects, because otherwise no reader will know
> if they set this or not.

Fair point. I'll see if I can draft something better. Suggestions
welcome.
--
Jeff Layton <jlayton@kernel.org>