On Sat, 2025-02-08 at 11:57 -0500, Chuck Lever wrote:
> On 2/7/25 4:53 PM, Jeff Layton wrote:
> > If the callback is going to be requeued to the workqueue, then release
> > the slot. The callback client and session could change and the slot may
> > no longer be valid after that point.
> >
> > Signed-off-by: Jeff Layton <jlayton@kernel.org>
> > ---
> > fs/nfsd/nfs4callback.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
> > index 79abc981e6416a88d9a81497e03e12faa3ce6d0e..bb5356e8713a8840bb714859618ff88130825efd 100644
> > --- a/fs/nfsd/nfs4callback.c
> > +++ b/fs/nfsd/nfs4callback.c
> > @@ -1411,6 +1411,7 @@ static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback
> > rpc_restart_call_prepare(task);
> > goto out;
> > requeue:
> > + nfsd41_cb_release_slot(cb);
> > if (!test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) {
> > trace_nfsd_cb_restart(clp, cb);
> > task->tk_status = 0;
> >
>
> The NFSv4.0 case also goes to the requeue label. Is
> nfsd41_cb_release_slot() a no-op for NFSv4.0?
>
Yes.
> Even if it is, this is a
> little confusing. Later, in 7/7, the nfsd41_cb_release_slot() call is
> carried into the helper that is called by both NFSv4.0 and NFSv4.1, and
> that doesn't seem necessary.
>
> Perhaps this change should be done /after/ the NFSv4.0 error flow is
> hoisted into nfsd4_cb_done().
>
Fair point. I'll move the v4.0 rework ahead of this patch and only call
nfsd41_cb_release_slot for v4.1+. I'll also fix the changelog of #3
like you suggested.
--
Jeff Layton <jlayton@kernel.org>