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 1E1741509A5 for ; Fri, 2 Feb 2024 17:56:16 +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=1706896577; cv=none; b=c2FUWtGCYd9oF5PKuln2IHO7aDA2lNtIwM2/pYOsi0dDIgCCjsUY+CgHGuNQF0vx87cc3gNZppK/WqYcBvrYwdJM4plj9f9qIPjaj/lG0VVSx04UX+g2VLylJh3Hi2WR2q5oulgbR+3Cwp36csHV8acZRdBwzrswl3zlRAcF/qs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706896577; c=relaxed/simple; bh=t3mUJkvuDBtjiNQRBzWSLaRPufdSRlkvAi0XLLJZR90=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Txz841WjsimSs+bYzhi0iSMScdoLMKAf/hBOCvraFbZmQfH7EFNOahGC7bjmjwaBgtF13cB8+/vHsw01vwWa3Mmh/k5v1txxWdzBs7yldI3joHtA/Pk9C2FDvIUsXGK/nWdenypt8iNHyRfWCgLOZwu4qwW7oTHNmolglvvcAE8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=caLVUr4Z; 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="caLVUr4Z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E277EC433F1; Fri, 2 Feb 2024 17:56:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706896576; bh=t3mUJkvuDBtjiNQRBzWSLaRPufdSRlkvAi0XLLJZR90=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=caLVUr4ZJuMzE3TsE5jzRAutGRvRfO7VFQGv//hX3CbsnDBAMJUIqJTykTa14E9d4 2psKjPP/x4EIskJGM4GPfg3mVhN1AyB90odnqfD/cU0dY006HtPRfozZmVpfFWfEUr y8TZ6XGzMHTG4qJIxuo8qL8IIgWIECP6b+6bbCz2xvdWhiDHrporB+d6H4kxEbCbnu iOLvNbw9vywGEZ5VjfCt8QM1XfzeAkKrTRtl0vguF5PAwrmsm4G+fn63HhvlfgcUQg gVKCqxoEqGMpXQGDCGzehWwvWKMKsu6gXM7V2Q0jBknZI/WeZTqLkRa4d+plJNHRTb GKVWKKJcgqsEg== Message-ID: Subject: Re: Should we establish a new nfsdctl userland program? From: Jeff Layton To: Lorenzo Bianconi Cc: Chuck Lever , NeilBrown , Dai Ngo , "olga.kornievskaia" , Tom Talpey , linux-nfs Date: Fri, 02 Feb 2024 12:56:14 -0500 In-Reply-To: References: <8a7bbc05b6515109692cb88ad68374d14fc01eca.camel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 (3.50.3-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2024-02-02 at 18:08 +0100, Lorenzo Bianconi wrote: > > The existing rpc.nfsd program was designed during a different time, whe= n > > we just didn't require that much control over how it behaved. It's > > klunky to work with. > >=20 > > In a response to Chuck's recent RFC patch to add knob to disable > > READ_PLUS calls, I mentioned that it might be a good time to make a > > clean break from the past and start a new program for controlling nfsd. > >=20 > > Here's what I'm thinking: > >=20 > > Let's build a swiss-army-knife kind of interface like git or virsh: > >=20 > > # nfsdctl=A0stats <--- fetch the new stats that got merged > > # nfsdctl add_listener <--- add a new listen socket, by address or hos= tname > > # nfsdctl set v3 on <--- enable NFSv3 > > # nfsdctl set splice_read off <--- disable splice reads (per Chuck's re= cent patch) > > # nfsdctl set threads 128 <--- spin up the threads > >=20 > > We could start with just the bare minimum for now (the stats interface)= , > > and then expand on it. Once we're at feature parity with rpc.nfsd, we'd > > want to have systemd preferentially use nfsdctl instead of rpc.nfsd to > > start and stop the server. systemd will also need to fall back to using > > rpc.nfsd if nfsdctl or the netlink program isn't present. > >=20 > > Note that I think this program will have to be a compiled binary vs. a > > python script or the like, given that it'll be involved in system > > startup. > >=20 > > It turns out that Lorenzo already has a C program that has a lot of the > > plumbing we'd need: > >=20 > > =A0=A0=A0=A0https://github.com/LorenzoBianconi/nfsd-netlink >=20 > This is something I developed just for testing the new interface but I ag= ree we > could start from it. >=20 > Regarding the kernel part I addressed the comments I received upstream on= v6 and > pushed the code here [0]. > How do you guys prefer to proceed? Is the better to post v7 upstream and = continue > the discussion in order to have something usable to develop the user-spac= e part or > do you prefer to have something for the user-space first? > I do not have a strong opinion on it. >=20 > Regards, > Lorenzo >=20 > [0] https://github.com/LorenzoBianconi/nfsd-next/tree/nfsd-next-netlink-n= ew-cmds-public-v7 >=20 >=20 My advice? Step back and spend some time working on the userland bits before posting another revision. Experience has shown that you never realize what sort of warts an interface like this has until you have to work with it. You may find that you want to tweak it some once you do, and it's much easier to do that before we merge anything. This will be part of the kernel ABI, so once it's in a shipping kernel, we're sort of stuck with it. Having a userland program ready to go will allow us to do things like set up the systemd service for this too, which is primarily how this new program will be called. --=20 Jeff Layton