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[209.132.180.67]) by mx.google.com with ESMTP id z25si7440810otp.310.2020.03.31.04.27.31; Tue, 31 Mar 2020 04:27:45 -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="N/GLW1oF"; 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 S1730442AbgCaLZ4 (ORCPT + 99 others); Tue, 31 Mar 2020 07:25:56 -0400 Received: from mail-lj1-f193.google.com ([209.85.208.193]:41427 "EHLO mail-lj1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730180AbgCaLZ4 (ORCPT ); Tue, 31 Mar 2020 07:25:56 -0400 Received: by mail-lj1-f193.google.com with SMTP id n17so21578214lji.8 for ; Tue, 31 Mar 2020 04:25:53 -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=jgIzEqM2LnXzzHvamHw2Hc0doSxZZqIged014OPYZ0c=; b=N/GLW1oFEDCQ7URS2WLGzLmJwWLDAHhMdnP/DjtzUiv/pmSayZhM604q+eXRSuKSox fVIur3LF2iFCCwdN9TPJmP2ZJBMiRnUUon4gjk8p4INkbpG3/wbZ4d8HaR8WjOgaR0XP VX7ae0ZYBui7NTCWEUNvg9Cm4feg1FDJi+4pmphpaOBMZlVjACtYYkAdS5kPPiWJU9sa vTFCuVaPHaKBshlk3/mEPamPWmBOjLqK2DzRJyP33+cHCTCBjwayCZu7YvmGkKGyVI3C cdNLr7VZu3I3e1CkVMYuWphdHkkNUsRc4GvY07AMDIjH7fmxKEAQX59A7pEMYxl6Osit Jkwg== 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=jgIzEqM2LnXzzHvamHw2Hc0doSxZZqIged014OPYZ0c=; b=GEZkStC+oYPH6rok30+n+62S3j27bSkc19uv77SDmZbpGX+NCIeFQez78klSybyZu3 5wGzM7nVRY3AYkuZ9pUPncPkiVMolGNUM/hdGYHWc5AVo9xygGY7q9sZNZdDQxpxPQLc eK4QoFcEgyqv0MmlfvmJYXCmvZZJXTFYlFXJrV7ZzoZVhj7F/EZ0plgCE7LN99ABgjpW D+mE9PthjmtSSMFilO6UdqJoALtQ3wraWSh19mT9tHxSfaTKasQHnExtB+T6GWzOdHMQ lcdo8ZfyFLXLabzHoOCZRw59qTEmnQwJD1uXDt45qEjcwJTSbRIAf9jGaz63HfG576tP WS7g== X-Gm-Message-State: AGi0PuYExaYyByqT4sOsqsT/xdJmaXUGdK0VaDchR923U6xFdWkxJo7C JVPFv6Y/7GKu7J9aSR9Tee3MQ/9bhMrKUTKScnWY2g== X-Received: by 2002:a2e:9681:: with SMTP id q1mr10418971lji.179.1585653953043; Tue, 31 Mar 2020 04:25:53 -0700 (PDT) MIME-Version: 1.0 References: <20200329140459.18155-1-maco@android.com> <20200330010024.GA23640@ming.t460p> <20200331074828.GA24372@lst.de> In-Reply-To: <20200331074828.GA24372@lst.de> From: Martijn Coenen Date: Tue, 31 Mar 2020 13:25:41 +0200 Message-ID: Subject: Re: [PATCH] loop: Add LOOP_SET_FD_WITH_OFFSET ioctl. To: Christoph Hellwig Cc: Ming Lei , Jens Axboe , 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 On Tue, Mar 31, 2020 at 9:48 AM Christoph Hellwig wrote: > I think the full blown set fd an status would seem a lot more useful, > or even better a LOOP_CTL_ADD variant that sets up everything important > on the character device so that we avoid the half set up block devices > entirely. Thanks for the feedback, I will work on that then. I think I could do both - LOOP_SET_FD_AND_STATUS and a new variant of LOOP_CTL_ADD that calls it - the former could still be useful if the kernel pre-created a large amount of loop devices. Martijn