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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 C92E9C433E1 for ; Thu, 27 Aug 2020 14:26:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A70C622BF5 for ; Thu, 27 Aug 2020 14:26:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="R4Sytix/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727992AbgH0O0M (ORCPT ); Thu, 27 Aug 2020 10:26:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57448 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727772AbgH0OZ7 (ORCPT ); Thu, 27 Aug 2020 10:25:59 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BAAFEC061233 for ; Thu, 27 Aug 2020 07:25:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=7NzD1gKfznZWf1LkUQkXxWpbHVPmKoibLPgjxPQ/270=; b=R4Sytix/0LHRKtNaufOhWPE8uD lFDlUqHzRLpg4SefXf8RJA/imvfGzBup/HDywHAQLEqlgmA2d90zFlxJ8A9u2qrIeOTLA05uwOHt+ LnblOkfFZ/3rDP7pvU0F7OALVg6r5sg2fzH+S+YkEGSGynHyPAtp5A4kFXo1OLremRj4fo4t+JOFn lhzW48GEBLZn9J4iZXrAqQdyJOF27L1LBbchCNTk66khQuZSTuGe6hTVok6elbVJ4upTPUZCAd+s3 xZvBDw5AohcjflyLEHsriUyrfzr8C7nFJ8C1DTUJo+MxYlWpKxJV40p88Ofzh5T6HIqG1yW0O95Zn HkIOqYGw==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kBIqY-000120-HW; Thu, 27 Aug 2020 14:25:46 +0000 Date: Thu, 27 Aug 2020 15:25:46 +0100 From: Matthew Wilcox To: Christian Schoenebeck Cc: Miklos Szeredi , "Theodore Y. Ts'o" , Frank van der Linden , Dave Chinner , "Dr. David Alan Gilbert" , Greg Kurz , linux-fsdevel@vger.kernel.org, Stefan Hajnoczi , Miklos Szeredi , Vivek Goyal , Giuseppe Scrivano , Daniel J Walsh , Chirantan Ekbote Subject: Re: file forks vs. xattr (was: xattr names for unprivileged stacking?) Message-ID: <20200827142546.GI14765@casper.infradead.org> References: <20200824222924.GF199705@mit.edu> <3331978.UQhOATu6MC@silver> <20200827140107.GH14765@casper.infradead.org> <159855515.fZZa9nWDzX@silver> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <159855515.fZZa9nWDzX@silver> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Thu, Aug 27, 2020 at 04:23:24PM +0200, Christian Schoenebeck wrote: > On Donnerstag, 27. August 2020 16:01:07 CEST Matthew Wilcox wrote: > > On Thu, Aug 27, 2020 at 03:48:57PM +0200, Christian Schoenebeck wrote: > > > On Donnerstag, 27. August 2020 14:25:55 CEST Matthew Wilcox wrote: > > > > On Thu, Aug 27, 2020 at 02:02:42PM +0200, Christian Schoenebeck wrote: > > > > > What I could imagine as delimiter instead; slash-caret: > > > > > /var/foo.pdf/^/forkname > > > > > > > > Any ascii character is going to be used in some actual customer > > > > workload. > > > > > > Not exactly. "/foo/^/bar" is already a valid path today. So every Linux > > > system (incl. all libs/apps) must be capable to deal with that path > > > already, so it would not introduce a tokenization problem. > > > > That's exactly the point. I can guarantee you that some customer is > > already using a file named exactly '^'. > > You are contradicting yourself. Ditching the idea because a file "^" might > exist, implies ditching your idea of "💩" as it might already exist as well. That's because THIS IS A SHIT IDEA. > > You misunderstood. This was my way of telling you that your idea is shit. > > Be invited for making better suggestions. But one thing please: don't start > getting offending. Oh, fuck off. > No matter which delimiter you'd choose, something will break. It is just about > how much will it break und how likely it'll be in practice, not if. > > If you are concerned about not breaking anything: keep forks disabled. My way of keeping forks disabled is to tell you to fuck off. You can keep fucking off until you get there. Then fuck off some more.