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=-0.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 670FAC2BA83 for ; Fri, 14 Feb 2020 18:27:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3623B2086A for ; Fri, 14 Feb 2020 18:27:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="hzXQOokN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388641AbgBNS1t (ORCPT ); Fri, 14 Feb 2020 13:27:49 -0500 Received: from mail-il1-f194.google.com ([209.85.166.194]:33039 "EHLO mail-il1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387718AbgBNS1t (ORCPT ); Fri, 14 Feb 2020 13:27:49 -0500 Received: by mail-il1-f194.google.com with SMTP id s18so8861069iln.0 for ; Fri, 14 Feb 2020 10:27:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=525HaDZiWE50FZ3TCtPQCNxuVnb7KtEWz5SDq7NWtZA=; b=hzXQOokN8B8QURVRTlJzusnJkUeSt7w7wuDjCPrZ6NCruf70fdnw9tlXTGVOx1NT48 8K28f127jMOYhCXKY0u4Y3h1Ax9zV10+kk1iK1I8w7sffsOgWx0Bxlo8PggWyCrZ7wFn pGnuOaQQtisG6Lpi+a/LHqAl2ZJqY67cyYmI2jmdsgafvf01Fj+Rh0equKGi8l3qwQHg lpM0CA83fWfVlfBTMfik07pgw0aQj2eDa+n74Mcrn7vPs1W1gXkGKWyXGy9FZ/MY5Jwp eX9tetyus1zoSbZaSdYeCijN8+9B+Ridcs1XSEKXooT5hfeFEgAzXvbwvsM4ZB1ZSjzM 4iEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=525HaDZiWE50FZ3TCtPQCNxuVnb7KtEWz5SDq7NWtZA=; b=acy3md1AtyY8N5g4uux5y+iRrxcqI40HuD3f8Edlj1mma6QmdgKD2atkNK1hoSnigM xTHsujTTKe9rFR/D8AYOfJMHrBsuoWsLp4oWh8jNqdv49Z44x28Q3Yo3HAHLbudNSa68 W42QQ+1Fu3Qs33D9lkmRDtC4hMnrRfS9/gvyt0mfZgFgQY+u43/Mu3w3M1+x9La+hSSL LhpL8LaScOfsJobij4dXpIG2lCRVfZpfAjftn2TfhcD2mz4RDqepWrKd/lGxHkSOaAQM igCyi6ZdKsJfE+7jcBGSDmy+BRbK+RJ3f5J0HN7ZuRHh8WEGSfMHvKI9dHA3ucYYANiD Wisw== X-Gm-Message-State: APjAAAXe+VjhDot7Tum9WkvO+Up+ELrORqntTlW8urFr3uGvvfBKl9JS B7kBog6eVT9RYDRYsFDys19rprNFMharmgZTOX8= X-Google-Smtp-Source: APXvYqxaPahU4lW8qm63HmvdGzXToS0WIXLN7PAHyAaOe/LhgE077r0yz0rodZE2f9D3MWG2LVXOioxI7+uAx31K1xY= X-Received: by 2002:a92:9f1a:: with SMTP id u26mr4321234ili.72.1581704868824; Fri, 14 Feb 2020 10:27:48 -0800 (PST) MIME-Version: 1.0 References: <20200214050853.GX23230@ZenIV.linux.org.uk> In-Reply-To: <20200214050853.GX23230@ZenIV.linux.org.uk> From: Amir Goldstein Date: Fri, 14 Feb 2020 20:27:37 +0200 Message-ID: Subject: Re: [Lsf-pc] [LSF/MM/BPF TOPIC] sorting pathwalk semantics out To: Al Viro Cc: lsf-pc@lists.linux-foundation.org, linux-fsdevel , Miklos Szeredi , David Howells , "Eric W. Biederman" , Aleksa Sarai , Jeff Layton Content-Type: text/plain; charset="UTF-8" Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Al, Just making this public as requested, so potential attendees can chime in. I suppose this was your intention. Thanks, Amir. On Fri, Feb 14, 2020 at 7:09 AM Al Viro wrote: > > There had been quite a bit of activity around that area > (openat2() series, for example) and IMO the complexity in the damn > thing is getting close to critical - we are not quite at the point > where the average amount of bugs introduced by fixing a bug is greater > than one, but it's uncomfortably close. Quite a few places are > far too subtle and convoluted (anything related to do_last(), for > one thing). > > We need to get that mess under control. I have a (still > growing) series massaging it to somewhat saner shape, but there > are some interesting dark corners that need to be sorted out (situation > around mount traps, for example). > > We definitely need to settle on some description of semantics. > Preferably with a set of litmus tests, similar to what memory model > folks had been doing. > > I would like to catch at least the people who'd been active > around that area. Miklos Szeredi (due to atomic_open involvement, > if nothing else), David Howells and Ian Kent (mount traps, among > other things), Eric Biederman (userns fallouts of all sorts), > Aleksa Sarai (openat2 - most recent large changes in the whole > thing), Jeff Layton (revalidation et.al.)... > _______________________________________________ > Lsf-pc mailing list > Lsf-pc@lists.linux-foundation.org > https://lists.linuxfoundation.org/mailman/listinfo/lsf-pc