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 93DE521C188 for ; Fri, 7 Mar 2025 15:00:14 +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=1741359614; cv=none; b=L4Uwqj2p+3tUtpqbLfKAb3K97E7uK2boB3iS/dv2odCnCE8yD1V9DmruO0zIgPc/wEnM3ShIg3QF0OhW4Qzjj9apaUCjIO3uQ1j82hCGJf4X+SFz4uiAPKzfQb8m9CGvc17BkROm2diLCAk4VZUG5YolF7uhAiE+PCOi65V4Us4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741359614; c=relaxed/simple; bh=xg4qOs5bYLDUMDr7bNSBha+SeWFlczrNiOCTQh8MqzY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Fga3umBcO7ZmEXBwC8xMbPZhkiBWjhMcRlOB7z7s3VKiBB1rlEBSv4IEAEaHvdPqBbSG0/9/aW4ARStOZVsJDFh7tCEYJM07uWiB55Iu7Hxe2WDB1Y0dMNa0+wPHnXrFn1vQG0BkK0MttRltRCOoY0//m+kPnCRkfOUmUJOsZqY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=N4XanPPm; 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="N4XanPPm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83A79C4CED1; Fri, 7 Mar 2025 15:00:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741359614; bh=xg4qOs5bYLDUMDr7bNSBha+SeWFlczrNiOCTQh8MqzY=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=N4XanPPmUeFEcETnvJpL3gGbplxjiSgX+9/r/S564Eq+BrZvCMIXH34y9d37VBc4k iIjmB87MnmbdyP00MucZZC6jzBrdaI6+zFzifN0B3tg5AU6detn586aqOmcu38rzkC UVemiWxTAv/Mgrbc0Ntz4ybf45ZyG/X/BqLsl3zEc6QVnRKE4UdVlqCSBhLXcdgNgI 5f/6QwReZwq+orqeGHeLqF4xrlsRiKwkMYBZc88u5UBb89jTARMMi3L2AptYC/p94I 57LudYf4etvl5fQbsdxzWrohK2GQs7RvCuXW/fWS8FPxMPuEsScoAYHTcx/gJoA+AI IB3pweTh7JvGg== Message-ID: Subject: Re: [PATCH v2 0/5] Implement referring call lists for CB_OFFLOAD From: Jeff Layton To: cel@kernel.org, Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: linux-nfs@vger.kernel.org, Chuck Lever Date: Fri, 07 Mar 2025 10:00:12 -0500 In-Reply-To: <20250301183151.11362-1-cel@kernel.org> References: <20250301183151.11362-1-cel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV 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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 I think this all looks good for a first pass, and should be OK for COPY. You can add: Reviewed-by: Jeff Layton I think we'll eventually want this for longer-lived stateids too. Specifically: CB_RECALL CB_LAYOUTRECALL CB_NOTIFY_LOCK 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. If we don't do that, then we could end up with rather long referring call lists, with a bunch of long-completed calls.