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=-4.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 74C8BC433E4 for ; Tue, 28 Jul 2020 06:25:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 51C3D20792 for ; Tue, 28 Jul 2020 06:25:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=tfz-net.20150623.gappssmtp.com header.i=@tfz-net.20150623.gappssmtp.com header.b="YPBKAucS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726746AbgG1GZy (ORCPT ); Tue, 28 Jul 2020 02:25:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45390 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726920AbgG1GZv (ORCPT ); Tue, 28 Jul 2020 02:25:51 -0400 Received: from mail-wr1-x441.google.com (mail-wr1-x441.google.com [IPv6:2a00:1450:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6CE9AC0619D4 for ; Mon, 27 Jul 2020 23:25:50 -0700 (PDT) Received: by mail-wr1-x441.google.com with SMTP id r4so14101756wrx.9 for ; Mon, 27 Jul 2020 23:25:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tfz-net.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=7etnaWOwVx6vNnoAvWMwIKpf2RbffIgHQ+Ut1q/2kv8=; b=YPBKAucSuaaf0P/MoRJbUS6YUlX4lgKwIHfXj8kMmn7VgUjhZkX5rNqMQtZU8B+5X/ Xc4ch8YTm38tgIYFMi9LaOKn7TYaAOgQjIxwxxdC7aG1uMFStwiaiCOqhsLIn3R7vszK SIbUHh7CNbo0zBtb1j5l8IjEVQ9tvgHYkjFitOyITdWxWZzgWed5r3I0PXE6ThDfU5HN n5YMY+nNygQOKo8PLMPqjSn4yRgjjVZiRjewR3r72lviGgzsbFu5QO6pEWTUeh0uAG09 BH9WwFswLLnlzagBOmXVavtQbx0Z9ZIWtqDvwLC+6vh1QwcCKe7UIHHwlqubNonY8FlS Wvmw== 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=7etnaWOwVx6vNnoAvWMwIKpf2RbffIgHQ+Ut1q/2kv8=; b=onVCMV7pWdT5hr9Yvut9Xb6vPtax1kiZuNg1GbK9aPTsctmMzRQU/j6BxoN+30qSwN Iitu/ddIxHWQBqpz1iA0G6Pb4VBO8L3QcnHjK+aapqspcqW9i/8yhNSXjhhC7kd6DAH8 QaYwcTZROwKSJCDaVIvIePFTpCphUsoLyOYta29v053i1n4TBdnYU9XWBtE6CvcP97hE GHxUKg/OXEQ7a0TmmdGlRyHH5YFSH8XxDcN0KPFqSXYUUe5viFqEMclPSME0Xify5osi G9tfPrxCetnEYmckK2Bq9SiGKGQ89nLa0CoMQXjPb/FLNpapskHTS3FBJFYICI1RHIVA 5OHA== X-Gm-Message-State: AOAM5307yO3Br/Dsqn4DYfGdWwigzs8Hs/AIbpn0iDGDTE8jGyfRHoh0 iHfu1uAm7mWxTDKK/1mLkHVAfVBbHsBUESysX1LZBQ== X-Google-Smtp-Source: ABdhPJyad6Em+rX/p7Ji908ZQHajh7zAhsMAC2huISArT4VENpdGyGPdZ94rIl1ouUQwvSKcqdf81TYCZkrnf40qg70= X-Received: by 2002:a5d:40cf:: with SMTP id b15mr23050073wrq.319.1595917549191; Mon, 27 Jul 2020 23:25:49 -0700 (PDT) MIME-Version: 1.0 References: <20200725045921.2723-1-kalou@tfz.net> <20200725052236.4062-1-kalou@tfz.net> <20200727142140.GA116567@localhost.localdomain> In-Reply-To: From: Pascal Bouchareine Date: Mon, 27 Jul 2020 23:25:38 -0700 Message-ID: Subject: Re: [PATCH v3] proc,fcntl: introduce F_SET_DESCRIPTION To: Alexey Dobriyan Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, Al Viro , Jeff Layton , "J. Bruce Fields" Content-Type: text/plain; charset="UTF-8" Sender: linux-api-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org On Mon, Jul 27, 2020 at 6:39 PM Pascal Bouchareine wrote: > > struct file is nicely aligned to 256 bytes on distro configs. > > Will this break everything? > > > > $ cat /sys/kernel/slab/filp/object_size > > Indeed on the config I'm using here this jumped to 264 bytes > > Would it be better to move this to the inode struct? I don't know the > implications of this - any other option? Well it doesn't actually make much sense to share that at that level However the above 264 is building from 5.4 without f_sb_err, so I think master already passed the 256 bytes too ?