From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 690D3C433DF for ; Thu, 25 Jun 2020 20:07:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 306AC20767 for ; Thu, 25 Jun 2020 20:07:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fieldses.org header.i=@fieldses.org header.b="j3Q8yvyo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388902AbgFYUHU (ORCPT ); Thu, 25 Jun 2020 16:07:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42808 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388615AbgFYUHU (ORCPT ); Thu, 25 Jun 2020 16:07:20 -0400 Received: from fieldses.org (fieldses.org [IPv6:2600:3c00:e000:2f7::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10855C08C5C1 for ; Thu, 25 Jun 2020 13:07:20 -0700 (PDT) Received: by fieldses.org (Postfix, from userid 2815) id 381C1BD0; Thu, 25 Jun 2020 16:07:19 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.11.0 fieldses.org 381C1BD0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fieldses.org; s=default; t=1593115639; bh=ToNVmCsavYQcR+1vX03cWIfZbL2FhrOBS1OV0sY+CNs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=j3Q8yvyo4Fboqu7hae/qNpRQJxl2c+/m/P4UijZwX+qVXV55k+C/v5K7+Cz1/rT6d zJiJi3F8M0bybTBZ1eIAlRSi33OghC5dZf/JR3fxxu9zWRxzkHgmgpeq8MU7Nt7kA5 ZS1iM9/YEQDcUmWJ12/u8a/a1HZzye7XIDfvCtDg= Date: Thu, 25 Jun 2020 16:07:19 -0400 From: "J. Bruce Fields" To: Frank van der Linden Cc: chuck.lever@oracle.com, linux-nfs@vger.kernel.org Subject: Re: [PATCH v3 00/10] server side user xattr support (RFC 8276) Message-ID: <20200625200719.GB6605@fieldses.org> References: <20200623223927.31795-1-fllinden@amazon.com> <20200625165347.GB30655@fieldses.org> <20200625173916.GB29600@dev-dsk-fllinden-2c-c1893d73.us-west-2.amazon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200625173916.GB29600@dev-dsk-fllinden-2c-c1893d73.us-west-2.amazon.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org On Thu, Jun 25, 2020 at 05:39:16PM +0000, Frank van der Linden wrote: > On Thu, Jun 25, 2020 at 12:53:47PM -0400, J. Bruce Fields wrote: > > CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe. > > > > By the way, I can't remember if I asked this before: is there a > > particular use case that motivates this xattr work? > > There's one use case that I can't really talk about publicly at this point > (and it's not my code either, so I wouldn't have all the details). Nothing > super secret or anything - it's just something that is not mine, > so I won't try to speak for anyone. We wanted to get this upstreamed first, > as that's the right thing to do. > > Since I posted my first RFC, I did get contacted off-list by several > readers of linux-nfs who wanted to use the feature in practice, too, so > there's definitely interest out there. Yeah, I always hear a lot of interest but then have trouble sorting through it for the cases that are actually *user* xattr cases, where the server has to just act as a dumb store of the values. There are some. But unfortunately xattrs are best known for enabling selinux and posix acls, and to a lesser extent accessing random other filesystem features, so that tends to be what comes to people's minds first, though it's not what we're doing. --b.