From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E0B3521D58C for ; Fri, 7 Mar 2025 16:07:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741363643; cv=none; b=TolEVV5CWB/xBGty70wiaabNeYV1XJhW6u9vG/V289vBphl3AeTE4UmnqNVhucAGdjpbKnupsvnDggTgKIL2Ip9jzrLwzQ20tSaUZPQoPsU2ZM8kySxQgljz6CMdr0cK6KcNekzXfu6U2MA39RDxQBIuFOOIy/aWvxgBh4zuOsI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741363643; c=relaxed/simple; bh=Hszfjp+hanEQIXj3JI+M+SjYn72b3kM3z+3y2fcvQKs=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=BDhf+bqMCZXG+qhsESj1rPT4pPSafeVUgIhqJiD178sN2xZWJP3su9wNeCm4YkfkMzxqaCQXHV2PoX4094OqX63TV4GxMUg1un1vZO9ZISEu0/LFpcT7jF2hZecnG6NqfEz1epPrgHUmuSIYDuLiNaNOUzt3qH8bvcJmajoX1bA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LL9ivkDg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LL9ivkDg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BAA2DC4CED1; Fri, 7 Mar 2025 16:07:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741363642; bh=Hszfjp+hanEQIXj3JI+M+SjYn72b3kM3z+3y2fcvQKs=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=LL9ivkDgDATCok9tPuO6etm4Dytt0+LVfHZyqSE75QcKAw8CG7caLX0BSzy+JmJxq nsFJcDPQ45JVTyC6uyUDobMfi1MQPsDl7Ju5qdzadYkmSxClEoSCE11qHeuEZbAYbj xaCm6iA1E5AoVGwkwgbe6VHTCRjGD3tyWd3pwMV5Z9gLnqn3E4W+Sqb6Wk8VHNU0FZ 4DMe3+k+uTn9E0PdgNGGQP/vjRK4rU7+HufEzG5Wwq8jqVZRGwJy0hKtxbNlWkujOu yq9ggQHtB6XjGxmLtOVvrWqZ8zRdCIdTjWz4h68AaqUeHBr23QBigzS0Zw0NbMK7B4 DnPULE4DvyvZQ== Message-ID: Subject: Re: [PATCH v2 0/5] Implement referring call lists for CB_OFFLOAD From: Jeff Layton To: Chuck Lever , cel@kernel.org, Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: linux-nfs@vger.kernel.org Date: Fri, 07 Mar 2025 11:07:20 -0500 In-Reply-To: <2c7f1ac9-5715-48e5-80e6-61b8fd856e4a@oracle.com> References: <20250301183151.11362-1-cel@kernel.org> <2c7f1ac9-5715-48e5-80e6-61b8fd856e4a@oracle.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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Layton wrote: > > On Sat, 2025-03-01 at 13:31 -0500, cel@kernel.org wrote: > > > From: Chuck Lever > > >=20 > > > I've built a naive proof-of-concept of the csa_referring_call_list > > > argument of the CB_SEQUENCE operation, and hooked it up for the > > > CB_OFFLOAD callback operation. > > >=20 > > > This has been pushed to my kernel.org "fix-async-copy" branch for > > > folks to play around with. > > >=20 > > > I've done some basic testing with a server that ensures the > > > CB_OFFLOAD callback is sent before the COPY reply, while running a > > > network capture. Operation appears correct, Wireshark is happy > > > with the construction of the XDR, and the CB_SEQUENCE arguments > > > match the SEQUENCE operation in the COPY COMPOUND. > > >=20 > > > I'd like to include this series in nfsd-testing. > > >=20 > > > Changes since RFC: > > > - Add a field to struct nfsd4_slot that records its table index > > > - Include a few additional COPY-related fixes > > > - Some operational testing has been done > > >=20 > > > Chuck Lever (5): > > > NFSD: OFFLOAD_CANCEL should mark an async COPY as completed > > > NFSD: Shorten CB_OFFLOAD response to NFS4ERR_DELAY > > > NFSD: Implement CB_SEQUENCE referring call lists > > > NFSD: Record each NFSv4 call's session slot index > > > NFSD: Use a referring call list for CB_OFFLOAD > > >=20 > > > fs/nfsd/nfs4callback.c | 132 +++++++++++++++++++++++++++++++++++++++= -- > > > fs/nfsd/nfs4proc.c | 16 ++++- > > > fs/nfsd/nfs4state.c | 38 ++++++------ > > > fs/nfsd/state.h | 23 +++++++ > > > fs/nfsd/xdr4.h | 4 ++ > > > fs/nfsd/xdr4cb.h | 5 +- > > > 6 files changed, 193 insertions(+), 25 deletions(-) > > >=20 > >=20 > > I think this all looks good for a first pass, and should be OK for > > COPY. You can add: > >=20 > >=20 > > Reviewed-by: Jeff Layton >=20 > Thanks! >=20 >=20 > > I think we'll eventually want this for longer-lived stateids too. > > Specifically: > >=20 > > CB_RECALL > > CB_LAYOUTRECALL > > CB_NOTIFY_LOCK > >=20 > > The main thing missing for that is the ability to free referring call > > records once we ensure that the client has seen the reply. For > > instance, if nfsd records a referring call on slot:seq 1:2, then once > > it sees a SEQUENCE for 1:3, then it doesn't need to keep around the > > referring call for 1:2. The server knows that call is no longer in > > flight so it's no longer needed. > >=20 > > If we don't do that, then we could end up with rather long referring > > call lists, with a bunch of long-completed calls. >=20 > Agreed that RCLs will have uses outside of COPY. I don't have a good > understanding of the use cases you mention above, so it would delay > RCL support in CB_OFFLOAD quite a bit if we were to wait for the > implementation of the other use cases. >=20 >=20 The use-cases for CB_RECALL and CB_LAYOUTRECALL are basically the same:=C2=A0 Server handed out a delegation or layout stateid, and then had to immediately recall it. We need the RCL in case the callback races ahead of the reply that has the stateid. Now that I look, I don't think it's actually needed for CB_NOTIFY_LOCK (no stateid in the call), so we can strike that one off the list. --=20 Jeff Layton