Re: [PATCH v4 4/8] NFSD: Send a meaningful CB_RECALL_ANY keep count

On Sun, Aug 16, 2026, at 2:42 AM, Cedric Blancher wrote:
> Could you please backport this to the stable branches up to Linux
> 5.10,

v6.18 is as far back as this series can apply with reasonable
effort.


> because conforming NFSv4.1 clients get robbed of all their
> delegations if craa_objects_to_keep=0.

What you are describing is a client bug. RFC 8881 Section 20.6.3
says clients get to choose which and how many delegations to
return in response to a CB_RECALL_ANY request.

I say this to suggest that, if this situation is troublesome in
your environment, clients that respond to CB_RECALL_ANY by
returning all delegations unconditionally are not conformant,
but are defective and should be fixed.


-- 
Chuck Lever