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=-3.8 required=3.0 tests=BAYES_00, 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 4689EC433E0 for ; Sat, 13 Feb 2021 00:43:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F106964EA1 for ; Sat, 13 Feb 2021 00:43:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232065AbhBMAnL (ORCPT ); Fri, 12 Feb 2021 19:43:11 -0500 Received: from smtprelay0251.hostedemail.com ([216.40.44.251]:38212 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S229718AbhBMAm7 (ORCPT ); Fri, 12 Feb 2021 19:42:59 -0500 Received: from filter.hostedemail.com (clb03-v110.bra.tucows.net [216.40.38.60]) by smtprelay05.hostedemail.com (Postfix) with ESMTP id 94826183F96AD; Sat, 13 Feb 2021 00:42:17 +0000 (UTC) X-Session-Marker: 6A6F6540706572636865732E636F6D X-HE-Tag: eggs62_5c0b6cc27625 X-Filterd-Recvd-Size: 3191 Received: from [192.168.1.159] (unknown [47.151.137.21]) (Authenticated sender: joe@perches.com) by omf19.hostedemail.com (Postfix) with ESMTPA; Sat, 13 Feb 2021 00:42:16 +0000 (UTC) Message-ID: Subject: Re: [PATCH] proc: Convert S_ permission uses to octal From: Joe Perches To: "Eric W. Biederman" , Matthew Wilcox Cc: Andrew Morton , Alexey Dobriyan , linux-fsdevel , LKML Date: Fri, 12 Feb 2021 16:42:15 -0800 In-Reply-To: References: <85ff6fd6b26aafdf6087666629bad3acc29258d8.camel@perches.com> <20210212221918.GA2858050@casper.infradead.org> Content-Type: text/plain; charset="ISO-8859-1" User-Agent: Evolution 3.38.1-1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2021-02-12 at 17:48 -0600, Eric W. Biederman wrote: > Matthew Wilcox writes: > > On Fri, Feb 12, 2021 at 04:01:48PM -0600, Eric W. Biederman wrote: > > > Perhaps we can do something like: > > > > > > #define S_IRWX 7 > > > #define S_IRW_ 6 > > > #define S_IR_X 5 > > > #define S_IR__ 4 > > > #define S_I_WX 3 > > > #define S_I_W_ 2 > > > #define S_I__X 1 > > > #define S_I___ 0 > > > > > > #define MODE(TYPE, USER, GROUP, OTHER) \ > > > (((S_IF##TYPE) << 9) | \ > > >          ((S_I##USER) << 6) | \ > > >          ((S_I##GROUP) << 3) | \ > > >          (S_I##OTHER)) > > > > > > Which would be used something like: > > > MODE(DIR, RWX, R_X, R_X) > > > MODE(REG, RWX, R__, R__) > > > > > > Something like that should be able to address the readability while > > > still using symbolic constants. > > > > I think that's been proposed before. > > I don't think it has ever been shot down. Just no one care enough to > implement it. From: Linus Torvalds Date: Tue, 2 Aug 2016 16:58:29 -0400 Message-ID: (raw) [ So I answered similarly to another patch, but I'll just re-iterate and change the subject line so that it stands out a bit from the millions of actual patches ] On Tue, Aug 2, 2016 at 1:42 PM, Pavel Machek wrote: > > Everyone knows what 0644 is, but noone can read S_IRUSR | S_IWUSR | > S_IRCRP | S_IROTH (*). Please don't do this. Absolutely. It's *much* easier to parse and understand the octal numbers, while the symbolic macro names are just random line noise and hard as hell to understand. You really have to think about it. So we should rather go the other way: convert existing bad symbolic permission bit macro use to just use the octal numbers. The symbolic names are good for the *other* bits (ie sticky bit, and the inode mode _type_ numbers etc), but for the permission bits, the symbolic names are just insane crap. Nobody sane should ever use them. Not in the kernel, not in user space.