Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752107AbdGICp7 (ORCPT ); Sat, 8 Jul 2017 22:45:59 -0400 Received: from sequoia-grove.ad.secure-endpoints.com ([208.125.0.235]:64834 "EHLO smtp.secure-endpoints.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751654AbdGICp6 (ORCPT ); Sat, 8 Jul 2017 22:45:58 -0400 X-Greylist: delayed 472 seconds by postgrey-1.27 at vger.kernel.org; Sat, 08 Jul 2017 22:45:57 EDT X-MDAV-Result: clean X-MDAV-Processed: smtp.secure-endpoints.com, Sat, 08 Jul 2017 22:38:04 -0400 VBR-Info: md=auristor.com; mc=all; mv=vbr.emailcertification.org; X-Spam-Processed: smtp.secure-endpoints.com, Sat, 08 Jul 2017 22:38:03 -0400 (not processed: message from trusted or authenticated source) X-MDRemoteIP: 2001:470:1f07:f77:ed50:986b:3520:275e X-MDHelo: [IPv6:2001:470:1f07:f77:ed50:986b:3520:275e] X-MDArrival-Date: Sat, 08 Jul 2017 22:38:03 -0400 X-Authenticated-Sender: jaltman@secure-endpoints.com X-Return-Path: prvs=136373cc56=jaltman@auristor.com X-Envelope-From: jaltman@auristor.com X-MDaemon-Deliver-To: linux-kernel@vger.kernel.org X-CAV-Result: clean Subject: Re: [PATCH 2/2] afs: Add metadata xattrs To: "Theodore Ts'o" , Linus Torvalds , Andreas Dilger , David Howells , Christoph Hellwig , Alexander Viro , linux-fsdevel , Linux API , linux-afs@lists.infradead.org, Linux Kernel Mailing List References: <20170706152304.GA10584@infradead.org> <149935261019.29744.8564287571048506851.stgit@warthog.procyon.org.uk> <149935262759.29744.6299062653432480230.stgit@warthog.procyon.org.uk> <31934.1499357651@warthog.procyon.org.uk> <2863583A-79F1-4998-8AC4-1C4C9D4C060F@dilger.ca> <20170709010155.3nql5ixdeozemgfd@thunk.org> From: Jeffrey Altman Openpgp: url=https://pgp.mit.edu Organization: AuriStor, Inc. (formerly Your File System, Inc.) Message-ID: <01f6dcaa-b310-63fa-f43d-2acf44d734c3@auristor.com> Date: Sat, 8 Jul 2017 22:37:53 -0400 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <20170709010155.3nql5ixdeozemgfd@thunk.org> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms090802030407060405010900" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8081 Lines: 159 This is a cryptographically signed message in MIME format. --------------ms090802030407060405010900 Content-Type: multipart/mixed; boundary="------------497045AE335F2A0CDD70A43E" Content-Language: en-US This is a multi-part message in MIME format. --------------497045AE335F2A0CDD70A43E Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 7/8/2017 9:01 PM, Theodore Ts'o wrote: > On Sat, Jul 08, 2017 at 12:44:54PM -0700, Linus Torvalds wrote: >> Yeah, I think attributes are likely much better than some random crazy= >> ioctl interface. They can be listed with generic tools, and have >> various scripting interfaces in ways that ioctl's do not sanely have. >=20 > I personally don't have a particular problem with these xattrs. For > one thing, they are read-only. You use them just to find out the AFS > cell, the AFS "fid", and the AFS volume name. >=20 > I think the place where people will start getting nervous is when we > start adding "write-only" xattrs or where writing to an xattr causes a > side-effect to take place. Ted, The list of AFS pioctls and the proposed alternatives for kAFS are listed at https://www.infradead.org/~dhowells/kafs/user_interface.html While it is true that the majority of the proposed xattrs are read-only properties of AFS objects (cell, volume, fid, servers, sec_class, sec_mode) there is one exception that is read-write (acls). AuriStorFS permits acls to be set per-file; there was some per-file acl work begun for OpenAFS but it was never completed. Is there an alternative for fetching and setting ACLs that should be considered? Jeffrey Altman --------------497045AE335F2A0CDD70A43E Content-Type: text/x-vcard; charset=utf-8; name="jaltman.vcf" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="jaltman.vcf" begin:vcard fn:Jeffrey Altman n:Altman;Jeffrey org:AuriStor, Inc. adr:Suite 6B;;255 West 94Th Street;New York;New York;10025-6985;United St= ates email;internet:jaltman@auristor.com title:Founder and CEO tel;work:+1-212-769-9018 note;quoted-printable:LinkedIn: https://www.linkedin.com/in/jeffreyaltman= =3D0D=3D0A=3D Skype: jeffrey.e.altman=3D0D=3D0A=3D =09 url:https://www.auristor.com/ version:2.1 end:vcard --------------497045AE335F2A0CDD70A43E-- --------------ms090802030407060405010900 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC 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