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[209.132.180.67]) by mx.google.com with ESMTP id v7si5983323otp.43.2020.03.30.01.07.18; Mon, 30 Mar 2020 01:07:31 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@android.com header.s=20161025 header.b=ck8aHNOK; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=android.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729586AbgC3IG4 (ORCPT + 99 others); Mon, 30 Mar 2020 04:06:56 -0400 Received: from mail-lj1-f195.google.com ([209.85.208.195]:44188 "EHLO mail-lj1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729546AbgC3IG4 (ORCPT ); Mon, 30 Mar 2020 04:06:56 -0400 Received: by mail-lj1-f195.google.com with SMTP id p14so17020238lji.11 for ; Mon, 30 Mar 2020 01:06:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=android.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=cpbDZfow9EQI0zYacEZrYwnx2hWkfZaFUAfP7urhVtE=; b=ck8aHNOKemLr0eK1wFhecWUyMMN3tcx9swMXPJ0V3neZKS4sIYl/mPMbO4EODJkGnI rjR/jc8+jKG8EUpLsubvgbYDv6aAA8KpmBh/zqfz6pFqkvmopCMlIGpkzKQBXgEHFXW2 LsBH0HQXBz+j94liTozEh/azRyZXW2fvNiv0zPxiYiKC/cCq/07MSlE2Q0EMLrbA98zp zCDrN5bxxpwzsCohTlzHQcf6qdYe89dQyq/der2we94ucljjrYD9VaFWG3oZIu97obSz g1xdv30ICv95KGl6jkShHsbkaHIK7wEumGrEIL/BNPnhDQrH+w9ndWQ67OOu5hGevJHc COGA== 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=cpbDZfow9EQI0zYacEZrYwnx2hWkfZaFUAfP7urhVtE=; b=gnWsjYOgWRnVvYefkJ+OR7JY+OiZ5jIRUdb1sM38rB9w/Pf0BE2wWkT5Qv+NQgcdFO hOVEmpc7aCCPLvCd9XATdPmD2aTYCGLJo1qitx2vVI+sPcnGWw974m9QBq4qxAl6/kwb 5M4QPvu1Ci4eFE/5VBxZLZHALn/hPMaNtqrXNPNbkuXonWgyvoUhICYWJgdE9XJRBUs9 YV1+8HyW272h0BJ/9BRO9TQTvTCRYofk/ZVDRR5ZTVNyMZk5MLFSkxEDHfw3DCk39S9L L6c79F2akHtxB7yfEVnAt+3AEYyslmr7Bv37b79ZchUgw/nwYy93+8ssmBcNWS1xLfJu OOVA== X-Gm-Message-State: AGi0PuaFkxRTv7nOjQnFMnUH+F3/9ZCB0fsZ1RS6ICrp5v9+83nQozsS 4ZWgwp9ys62mzhNSaYV3dJjwnSujO//9Qe4+GG3H6g== X-Received: by 2002:a2e:81c9:: with SMTP id s9mr6403337ljg.69.1585555611959; Mon, 30 Mar 2020 01:06:51 -0700 (PDT) MIME-Version: 1.0 References: <20200329140459.18155-1-maco@android.com> <20200330010024.GA23640@ming.t460p> In-Reply-To: <20200330010024.GA23640@ming.t460p> From: Martijn Coenen Date: Mon, 30 Mar 2020 10:06:41 +0200 Message-ID: Subject: Re: [PATCH] loop: Add LOOP_SET_FD_WITH_OFFSET ioctl. To: Ming Lei Cc: Jens Axboe , Christoph Hellwig , Bart Van Assche , Chaitanya Kulkarni , linux-block , LKML , kernel-team@android.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Ming, On Mon, Mar 30, 2020 at 3:00 AM Ming Lei wrote: > The new ioctl LOOP_SET_FD_WITH_OFFSET looks not generic enough, could > you consider to add one ioctl LOOP_SET_FD_AND_STATUS to cover both > SET_FD and SET_STATUS so that using two ioctl() to setup loop can become > deprecated finally? I originally started out doing that. However, it is a significantly larger refactoring of the loop driver, and it makes things like error handling more complex. I thought configuring loop with an offset is the most common case. But if there's a preference to do an ioctl that takes the full status, I can work on that. Best, Martijn > > > Thanks, > Ming >