Return-Path: linux-nfs-owner@vger.kernel.org Received: from mailgw02.dd24.net ([193.46.215.43]:49510 "EHLO mailgw02.dd24.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751717Ab3JZSAq (ORCPT ); Sat, 26 Oct 2013 14:00:46 -0400 Received: from localhost (amavis01.dd24.net [192.168.1.111]) by mailgw02.dd24.net (Postfix) with ESMTP id 9C186356B9A for ; Sat, 26 Oct 2013 18:00:43 +0000 (GMT) Received: from mailgw02.dd24.net ([192.168.1.197]) by localhost (amavis01.dd24.net [192.168.1.105]) (amavisd-new, port 10197) with ESMTP id oy4ddI3eisxF for ; Sat, 26 Oct 2013 18:00:38 +0000 (GMT) Received: from [192.168.0.101] (p54913AD7.dip0.t-ipconnect.de [84.145.58.215]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mailgw02.dd24.net (Postfix) with ESMTPSA id 59C5B356BBF for ; Sat, 26 Oct 2013 18:00:38 +0000 (GMT) Message-ID: <1382810435.29041.18.camel@heisenberg.scientia.net> Subject: Re: XATTRs in NFS? From: Christoph Anton Mitterer To: linux-nfs@vger.kernel.org Date: Sat, 26 Oct 2013 20:00:35 +0200 In-Reply-To: <8F7D9C5D-7E2F-459E-872C-2F4299943716@oracle.com> References: <1382560643.6924.12.camel@heisenberg.scientia.net> <1382624000.6907.8.camel@heisenberg.scientia.net> <1382630468.6907.58.camel@heisenberg.scientia.net> <625CAA34-BD6C-4283-86D0-3F8B460D54D0@netapp.com> <1382635350.6907.83.camel@heisenberg.scientia.net> <20131025140846.GB20497@fieldses.org> <526A8D9A.8090008@gmail.com> <8F7D9C5D-7E2F-459E-872C-2F4299943716@oracle.com> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-5AkLhaD129gE15dkDMUt" Mime-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org List-ID: --=-5AkLhaD129gE15dkDMUt Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2013-10-25 at 11:32 -0400, Chuck Lever wrote:=20 > Local file systems can support whatever they like, since they are > Linux-only. > NFS has to interoperate with other operating systems that may or may > not support xattrs, or may have something that looks like an xattr, > but really is subtly incompatible. Well but that alone can apply to most other things that NFS does support as well. Take NFS4 ACLs,... not (fully) supported by I'd guess every Linux filesystem (or was there some proposal for btrfs to get NFS4 ACLs in addition?) Or take very old filesystem who have no concept of different owners. etc. pp. In any case (as with Linux filesystems as well), I think XATTRs shouldn't be enabled by default, if NFS was to support them... and if someone activates it, he probably knows whether the backend fs does support it or not. > So we would like to see some very clear evidence that it's worth the > effort. Until then, Linux distributors are free to implement NFS > xattr support outside the standard NFS protocol (like the Solaris > NFSv3 ACL protocol) and support this themselves, perhaps as proof that > "if you build it, they will come." This always bears the danger that it will become a de facto standard that one cannot get rid of anymore. 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