Re: [PATCH RFC v22 1/7] NFSD: add courteous server support for thread with only delegation

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On 4/27/22 9:12 AM, J. Bruce Fields wrote:
On Wed, Apr 27, 2022 at 01:52:47AM -0700, Dai Ngo wrote:
+	if (!try_to_expire_client(clp)) {
+		nn = net_generic(clp->net, nfsd_net_id);
+		mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
+	}
...
+static inline bool try_to_expire_client(struct nfs4_client *clp)
+{
+	bool ret;
+
+	ret = NFSD4_ACTIVE ==
+		cmpxchg(&clp->cl_state, NFSD4_COURTESY, NFSD4_EXPIRABLE);
+	return ret;
+}
Hm, this feels a little backwards to me.

yes, I should have renamed the function to something like 'is_client_active()'.

   I'd expect
"try_to_expire_client" to return true on success.  Maybe call it
"client_is_expirable()" to make that clear?  Or stick with
"try_to_expire_client and make it return 0/-EAGAIN.

If "NFSD4_ACTIVE != cmpxchg(...)" is too confusing, I don't think we
really even need the atomic return of the previous value, I think it
would be OK just to do:

	cmpschg(&clp->cl_state, NFSD4_COURTESY, NFSD4_EXPIRABLE);
	return clp->cl_state == NFSD4_EXPIRABLE;

I'll change to this:

static inline bool try_to_expire_client(struct nfs4_client *clp)
{
        bool ret;
	
	cmpxchg(&clp->cl_state, NFSD4_COURTESY, NFSD4_EXPIRABLE);
	return clp->cl_state == NFSD4_EXPIRABLE;

}

and its caller:

	if (try_to_expire_client(clp)) {
		nn = net_generic(clp->net, nfsd_net_id);
		mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
	}

-Dai


--b.



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