From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 4670613C8F9 for ; Fri, 5 Jul 2024 13:39:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720186744; cv=none; b=e6Ps+CO9S0dVfqvunURLPJZJe0MHYTyj/ynp6pKzLmrebSm/VRRNZRMWK1I2xFE7Ht1KwipfDvLh0DHWyKOOZKveNwALTCqdHC/zxI355ewH82kcteWI2kJRlPwzPLIwoV+to3eBUIlMEBzRUiVzvIiKDUsi1Bb4EDa2U4dlciw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720186744; c=relaxed/simple; bh=9bXHFty0OfxLO+kYEneXjFYDhsYjcWWiXZSDsOX1yek=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=AzPgdo6SWmO1F2uDXJrHIKlg0bdLgVfV9YMBPpaInytuzdLGm/ZgTKcAO9hnGEuszt3SAlYUj50lUUf7LPKdTdm0RqwZxa3+4aZAGJvvZDFDXKDWc4E4f2kStp8DsUv/BBndbx0SpWyIy+Cl0Vo/C3sGU4M3M7IQZXvnHoBNzLs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=aJhFEtpr; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="aJhFEtpr" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=rIem0ZYwGt4dbVCnugmzgp3TRR0GBGP9mNZTLF3OqNo=; b=aJhFEtprsMvxJeCW+wwnWVDdl6 VYPeKpKLRBAn9jyUFK2MvIwbfetpcsLKv2W/rbRST/cunWQDA5pH12RvBiKfrXtNnumsXPrlXF7SQ vvfZb63XoVLhAtPA5DVWnRr3wO28tAWJEWgWhWg4idild1tLyHQEoQm1/itDiId0Im2C8SV4+/wRo HeNqET5qlw1tukglfwhrz7E7Ja5an8owY7yqNLaLDd2zNiGhaEyF8d1SJI8P0uEmd9lYW5ar/eZcW FIhtvrscU6ssM+xb4cLlmUUZ1BoSKX9k0SMOwbJasQuqis2byC9vXYzv312g1J/Bdfpd+SaMhJ11P z23DuMeg==; Received: from hch by bombadil.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1sPj9R-0000000G5Pw-3kFb; Fri, 05 Jul 2024 13:39:01 +0000 Date: Fri, 5 Jul 2024 06:39:01 -0700 From: Christoph Hellwig To: Chuck Lever III Cc: Christoph Hellwig , Mike Snitzer , Jeff Layton , Linux NFS Mailing List , Anna Schumaker , Trond Myklebust , Neil Brown , Dave Chinner Subject: Re: [PATCH v11 00/20] nfs/nfsd: add support for localio Message-ID: References: <4486ee80a487c174ec88c7e12705d99e22ae812a.camel@kernel.org> <57C1CB2B-3B46-48F3-A095-417845001C3E@oracle.com> Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <57C1CB2B-3B46-48F3-A095-417845001C3E@oracle.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Fri, Jul 05, 2024 at 01:35:18PM +0000, Chuck Lever III wrote: > I agree: I think the requirement for NFSv3 in this situation > needs a clear justification. Both peers are recent vintage > Linux kernels; both peers can use NFSv4.x, there's no > explicit need for backwards compatibility in the use cases > that have been provided so far. More importantly both peers are in fact the exact same Linux kernel instance. Which is the important point here - we are doing a bypass for a kernel talking to itself, although a kernel suffering from multiple personality (dis)order where the different sides might expose very different system views.