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 594B42356A4; Wed, 19 Nov 2025 14:12:19 +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=1763561539; cv=none; b=UcZrPwEkc6+pm0C8jnPwTXeJg3ItRkRwCSuSfPrZvi+EZDfUSLz+iA0X46l2A5l7aj1/5CrnIp2PDdxgxfN1Ay5d7Br3vn1Ima0yQ0lEChrSoaNpoPwnYES9ZSlC36rwcX25PK8E61lYAup8/e5mMq7Aa+tSokK3yfh5na4ahHs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763561539; c=relaxed/simple; bh=KTAsJRnNf2T9ptHG0rrJWnecMdUuXLm3jwW4S3a6aEk=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=gCkFZzQzFLHAYRvAGi1WigTsv//JmRJmdQiLF8jTJnyx+X1chfMf8leX5uQWMVYZoArKNQlmVugOXH4utqRwBkDqL7HtOo92vsQ5Cfq9pwvfPvkaKFU1bocoTP6TeAVgG30Gw/ZR1qQ7NuzFfO1E+MCLGye2Wn4NxwtdinpNTVM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NcXHW10W; 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="NcXHW10W" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 77573C19421; Wed, 19 Nov 2025 14:12:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763561538; bh=KTAsJRnNf2T9ptHG0rrJWnecMdUuXLm3jwW4S3a6aEk=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=NcXHW10WAkl6H7x8+n/XINdGGSWGDD0oR7Y3Vl4rNJ/9f/PPiU/o5sXSos6aMA1u/ 0xZMBoaODw3PTo1sFirHX+gReIm5jiapRIlrT71GNPll8NwOchT5Uf/bxl03V5VbsN dHrmq5djTNpdoh6SsHOt8L0q/8dpvN8hqF7tEOpQLiMKfj0SaWDF1n3vqVjK1fyQRG nUO9J5dTyS9KXXkSjpPesRJNJ7citcOpmEvJDyuqYA3Uf/gjaQGYs05jBJ69FBIWnJ wP3uBQj+9XgC0Pwqv3/NWL6ehVlxUvrQkCJpThkVZUIyW9Mf5Z93Vla2Uqnvc5j0b2 WfbG/EdU3rA8Q== Message-ID: Subject: Re: [PATCH v4 3/3] FSD: Fix NFS server hang when there are multiple layout conflicts From: Jeff Layton To: Chuck Lever , Christoph Hellwig , Dai Ngo Cc: neilb@ownmail.net, okorniev@redhat.com, tom@talpey.com, alex.aring@gmail.com, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org Date: Wed, 19 Nov 2025 09:12:15 -0500 In-Reply-To: References: <20251115191722.3739234-1-dai.ngo@oracle.com> <20251115191722.3739234-4-dai.ngo@oracle.com> <18135047-8695-4190-b7ca-b7575d9e4c6c@oracle.com> <20251119100526.GA25962@lst.de> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv 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linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2025-11-19 at 09:09 -0500, Chuck Lever wrote: > On 11/19/25 5:05 AM, Christoph Hellwig wrote: > > On Mon, Nov 17, 2025 at 11:40:22AM -0800, Dai Ngo wrote: > > > > If a .fence_client callback is optional for a layout to provide, > > > > timeouts for such layout types won't trigger any fencing action. I'= m not > > > > certain yet that's good behavior. > > >=20 > > > Some layout implementation is in experimental state such as block > > > layout and should not be used in production environment. I don't > > > know what should we do for that case. Does adding a trace point to > > > warn the user sufficient? > >=20 > > The block layout isn't really experimental, but really a broken protoco= l > > because there is no way to even fence a client except when there is > > a side channel mapping between the client identities for NFS and the > > storage protocol. >=20 > Is the protocol broken, or just incomplete, assuming that other > (unspecified) protocols are necessary to be provided? >=20 >=20 > > I'd be all in favour of deprecating the support ASAP and then removing > > it aggressively. > If we can say with some certainty that there are no users of the pNFS > block layout type, and there is no way of addressing the fencing issue, > then I'm willing to consider removing it. >=20 ACK on dropping it from my standpoint. I've also never seen a block layout setup in the wild. --=20 Jeff Layton