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=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 38FF8C43441 for ; Fri, 16 Nov 2018 07:01:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E779A20818 for ; Fri, 16 Nov 2018 07:01:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="U6oJUKo4" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E779A20818 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389343AbeKPRMk (ORCPT ); Fri, 16 Nov 2018 12:12:40 -0500 Received: from mail-wm1-f66.google.com ([209.85.128.66]:50666 "EHLO mail-wm1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727380AbeKPRMk (ORCPT ); Fri, 16 Nov 2018 12:12:40 -0500 Received: by mail-wm1-f66.google.com with SMTP id 124-v6so21119534wmw.0; Thu, 15 Nov 2018 23:01:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:subject:to:references:from:openpgp:autocrypt:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=/pIq4x0z0Jydx8S6oSjYzAJKPy4n3KFnv5oBJa03VF4=; b=U6oJUKo4Krrz5GwzQ7dbnWca0mE2j4M6LavXMyG+Ja4vtkdUoHn9+6F+/oXePNNl7v D5zpmHxWzywZR9RJcAV7NDkDfqY2DRBY78ZXuoqd+dapMZT8sjw5JsMahqagObBxNR9s F/cKQ1vXUg7m651U+93ZHAS1aLDDOm6vOLljLdxnuksOSe4NRFz7F2hd2BM1sOR2nzbV PlPlFKrhVmNUsDxc+u5wI9q8NUr1xwWSCOyaVWgUyjs4tFVMMQcHuV5eNkENaD9OA71y VaxFgwXIPd/WnNbI2Q/0oOznT+cW0Vkd91QgSKw68p3LFacBFMzH+DeBbx1dzMojSZDT oCBA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:subject:to:references:from:openpgp :autocrypt:message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=/pIq4x0z0Jydx8S6oSjYzAJKPy4n3KFnv5oBJa03VF4=; b=ttQuGxdsr2yovdSieDZWSYfy/UzKxHRMyH3za8GM1H+09jQYGLy8dqF6OWaW/9KXce HXdgDHEoz8kjEP4uf7pED5zcI68TSmW3MSw+15TV4IER10TAa6sCkeBBN/EVCpcSVu7t 6ii8wkGL7dZKzhSPnJBxgpb3Txe3Nehl9zb6iv/xIuZ7spP2tsjlfEmBJz0X/NYpxFPw bc5iRDRpusypJfPe3QpMNq4ww2yxeIQhChoJDr6wA80/omVUcj9GwKiIQKcjMaE5j6uB czlVq93OS8TFDrznsOr9GN98hJobMh4Eeclc+KSopW3lBmqyBJ4//0pVH+/hjl273DMc xL8Q== X-Gm-Message-State: AGRZ1gLsB1zuRk6KXfD9/15fQagFSBgzZNjiGzBwGcqiNegonzUc1xLS ZcVZyWhXUaiRgycr+6n3/ouyknH+ X-Google-Smtp-Source: AJdET5dZPxc+JrwYAFKk1oBqpPRaUnM+3v53vf1qpMla4AoNET5SqOurgxhBmLAQANv7gEpf1UNRmg== X-Received: by 2002:a1c:1f11:: with SMTP id f17mr5421191wmf.56.1542351690844; Thu, 15 Nov 2018 23:01:30 -0800 (PST) Received: from [192.168.10.150] ([93.56.166.5]) by smtp.googlemail.com with ESMTPSA id q2sm8730470wru.56.2018.11.15.23.01.29 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 15 Nov 2018 23:01:30 -0800 (PST) Subject: Re: [PATCH 0/3] SG_IO command filtering via sysfs To: Bart Van Assche , "Theodore Y. Ts'o" , linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, Hannes Reinecke , "Martin K. Petersen" , James Bottomley , Christoph Hellwig References: <1541867733-7836-1-git-send-email-pbonzini@redhat.com> <20181110190521.GA2627@thunk.org> <566bc821-f12a-f7c1-e7c7-99092807ee27@redhat.com> <20181111141426.GA7377@thunk.org> <98fe5cf7-722a-37d6-156d-842e8812e430@redhat.com> <1542328654.100259.18.camel@acm.org> From: Paolo Bonzini Openpgp: preference=signencrypt Autocrypt: addr=pbonzini@redhat.com; keydata= xsEhBFRCcBIBDqDGsz4K0zZun3jh+U6Z9wNGLKQ0kSFyjN38gMqU1SfP+TUNQepFHb/Gc0E2 CxXPkIBTvYY+ZPkoTh5xF9oS1jqI8iRLzouzF8yXs3QjQIZ2SfuCxSVwlV65jotcjD2FTN04 hVopm9llFijNZpVIOGUTqzM4U55sdsCcZUluWM6x4HSOdw5F5Utxfp1wOjD/v92Lrax0hjiX DResHSt48q+8FrZzY+AUbkUS+Jm34qjswdrgsC5uxeVcLkBgWLmov2kMaMROT0YmFY6A3m1S P/kXmHDXxhe23gKb3dgwxUTpENDBGcfEzrzilWueOeUWiOcWuFOed/C3SyijBx3Av/lbCsHU Vx6pMycNTdzU1BuAroB+Y3mNEuW56Yd44jlInzG2UOwt9XjjdKkJZ1g0P9dwptwLEgTEd3Fo UdhAQyRXGYO8oROiuh+RZ1lXp6AQ4ZjoyH8WLfTLf5g1EKCTc4C1sy1vQSdzIRu3rBIjAvnC tGZADei1IExLqB3uzXKzZ1BZ+Z8hnt2og9hb7H0y8diYfEk2w3R7wEr+Ehk5NQsT2MPI2QBd wEv1/Aj1DgUHZAHzG1QN9S8wNWQ6K9DqHZTBnI1hUlkp22zCSHK/6FwUCuYp1zcAEQEAAc0f UGFvbG8gQm9uemluaSA8Ym9uemluaUBnbnUub3JnPsLBTQQTAQIAIwUCVEJ7AwIbAwcLCQgH AwIBBhUIAgkKCwQWAgMBAh4BAheAAAoJEH4VEAzNNmmxNcwOniaZVLsuy1lW/ntYCA0Caz0i sHpmecK8aWlvL9wpQCk4GlOX9L1emyYXZPmzIYB0IRqmSzAlZxi+A2qm9XOxs5gJ2xqMEXX5 FMtUH3kpkWWJeLqe7z0EoQdUI4EG988uv/tdZyqjUn2XJE+K01x7r3MkUSFz/HZKZiCvYuze VlS0NTYdUt5jBXualvAwNKfxEkrxeHjxgdFHjYWhjflahY7TNRmuqPM/Lx7wAuyoDjlYNE40 Z+Kun4/KjMbjgpcF4Nf3PJQR8qXI6p3so2qsSn91tY7DFSJO6v2HwFJkC2jU95wxfNmTEUZc znXahYbVOwCDJRuPrE5GKFd/XJU9u5hNtr/uYipHij01WXal2cce1S5mn1/HuM1yo1u8xdHy IupCd57EWI948e8BlhpujUCU2tzOb2iYS0kpmJ9/oLVZrOcSZCcCl2P0AaCAsj59z2kwQS9D du0WxUs8waso0Qq6tDEHo8yLCOJDzSz4oojTtWe4zsulVnWV+wu70AioemAT8S6JOtlu60C5 dHgQUD1Tp+ReXpDKXmjbASJx4otvW0qah3o6JaqO79tbDqIvncu3tewwp6c85uZd48JnIOh3 utBAu684nJakbbvZUGikJfxd887ATQRUQnHuAQgAx4dxXO6/Zun0eVYOnr5GRl76+2UrAAem Vv9Yfn2PbDIbxXqLff7oyVJIkw4WdhQIIvvtu5zH24iYjmdfbg8iWpP7NqxUQRUZJEWbx2CR wkMHtOmzQiQ2tSLjKh/cHeyFH68xjeLcinR7jXMrHQK+UCEw6jqi1oeZzGvfmxarUmS0uRuf fAb589AJW50kkQK9VD/9QC2FJISSUDnRC0PawGSZDXhmvITJMdD4TjYrePYhSY4uuIV02v02 8TVAaYbIhxvDY0hUQE4r8ZbGRLn52bEzaIPgl1p/adKfeOUeMReg/CkyzQpmyB1TSk8lDMxQ zCYHXAzwnGi8WU9iuE1P0wARAQABwsEzBBgBAgAJBQJUQnHuAhsMAAoJEH4VEAzNNmmxp1EO oJy0uZggJm7gZKeJ7iUpeX4eqUtqelUw6gU2daz2hE/jsxsTbC/w5piHmk1H1VWDKEM4bQBT uiJ0bfo55SWsUNN+c9hhIX+Y8LEe22izK3w7mRpvGcg+/ZRG4DEMHLP6JVsv5GMpoYwYOmHn plOzCXHvmdlW0i6SrMsBDl9rw4AtIa6bRwWLim1lQ6EM3PWifPrWSUPrPcw4OLSwFk0CPqC4 HYv/7ZnASVkR5EERFF3+6iaaVi5OgBd81F1TCvCX2BEyIDRZLJNvX3TOd5FEN+lIrl26xecz 876SvcOb5SL5SKg9/rCBufdPSjojkGFWGziHiFaYhbuI2E+NfWLJtd+ZvWAAV+O0d8vFFSvr iy9enJ8kxJwhC0ECbSKFY+W1eTIhMD3aeAKY90drozWEyHhENf4l/V+Ja5vOnW+gCDQkGt2Y 1lJAPPSIqZKvHzGShdh8DduC0U3xYkfbGAUvbxeepjgzp0uEnBXfPTy09JGpgWbg0w91GyfT /ujKaGd4vxG2Ei+MMNDmS1SMx7wu0evvQ5kT9NPzyq8R2GIhVSiAd2jioGuTjX6AZCFv3ToO 53DliFMkVTecLptsXaesuUHgL9dKIfvpm+rNXRn9wAwGjk0X/A== Message-ID: Date: Fri, 16 Nov 2018 08:01:29 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0 MIME-Version: 1.0 In-Reply-To: <1542328654.100259.18.camel@acm.org> Content-Type: text/plain; charset=UTF-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 16/11/18 01:37, Bart Van Assche wrote: > All user space interfaces in the Linux kernel for storage that I'm familiar > with not only allow configuration of parameters but also make it easy to > query which parameters have been configured. The existing sysfs and configfs > interfaces demonstrate this. Using BPF to configure SG/IO access has a > significant disadvantage, namely that it is very hard to figure out what has > been configured. Figuring out what has been configured namely requires > disassembling BPF. I'm not sure anyone will be enthusiast about this. Well, that's a problem with BPF in general. With great power comes great obscurability. Paolo