Received: by 2002:a05:6a10:f347:0:0:0:0 with SMTP id d7csp260196pxu; Fri, 4 Dec 2020 02:36:27 -0800 (PST) X-Google-Smtp-Source: ABdhPJwlJX54eyTId7SiRkSSlQGozrddIoh9bRsYhoPrV3dA66ghtweiHk3L/oGSMsjjb2Wcg19G X-Received: by 2002:a17:906:7087:: with SMTP id b7mr6324772ejk.70.1607078187374; Fri, 04 Dec 2020 02:36:27 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1607078187; cv=none; d=google.com; s=arc-20160816; b=iTN0kbV09A0qT31REx/awxrwOetP29z59WJ7uvSvGU+ZVrc8VSWseaWPFXteZFZVlv ckPY6CQFkqXhmdd9bmgBQRtBih54Auuyi7VjHJW3O9T/iDhYanwmRYwbuoaZkUpmae+P zSB9at4ebNUre596RHjmMEK/TZfRyiekPnTgYBdbNnAv3IvpT1UcH58pZGDlvPkxkPmF HGz2njaUoi2qHr7S3fp34lQrR4wr76KwlnwxMjk09KGviZQefrP37A4Jbb5zJlLkGnJx oZ4rA09veCNeKfxvPQdDNKk1ky9rxcoGtTlOBxwTaai+yz5n9ekDrGpTzZj8NviaEOgJ GNow== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=z4RxJ3lOSf3eG4bi7IMzxDt9+2ZdQf43ibMQAm5S5Cs=; b=CgYn2QbBv0YDXZH7HGlRyXMBv2kMmicvjOEFsjFdttQV8QuOUPDV54x0QolrzqcjRl PDDAti+FLSfYLjQY7VHuq15Tm7Y1QaQhLUX4rPpIsKBHdYIj/eY9S8tb3avmIRHor5F7 UL6xKb6YMxYRnRLyorGDqvXygHz9G5iXehVz8XWvXkY/JM/UczNlxrdTaIT+FlzU8N9V 2Hjug7G81wjrgkOuT6DeV7E7Pa9e9ybCTWSnivPJ+y9vNYYZSixwI0J6yOuUMOs6iiKx grkFuAsEL5OmQyRAOPYezz8aIaiZksquBfpan/gfvosShI3BCEDiZdbxCV0fDCIRM/LU 9oXA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=NfDRc7jA; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id x2si1040990ejb.174.2020.12.04.02.36.03; Fri, 04 Dec 2020 02:36:27 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=NfDRc7jA; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729774AbgLDKec (ORCPT + 99 others); Fri, 4 Dec 2020 05:34:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57560 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729032AbgLDKec (ORCPT ); Fri, 4 Dec 2020 05:34:32 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B6D3BC0613D1; Fri, 4 Dec 2020 02:33:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=z4RxJ3lOSf3eG4bi7IMzxDt9+2ZdQf43ibMQAm5S5Cs=; b=NfDRc7jAkWAZV7HxvQycJbxxwU MwxwTmRFOXnQ/I7U03uMlUr1gihelQ0GWLdiUp63iF+2zEHep2wIxxgpaJOAbS8VSlWXWfsFQAb3u ng7ZJVP6LTB01hxBMvfG5ABRMrvBqL+Zp16RiGXEP6QL3/RwyTpIf7b5qqIQ14SA7NBqCK+2EaXgr MPy3NUVs/UpL8esdYQ9ZpYT2aMWF5lt7kerOtdy1BUU+4Ki8ewX+YX1MtoqOqEkO/Y5KJnkYMuZ9l Sa7irtV0l9SkW2YwCW7fy6OtFTO8x6ECH1hez8fi49JV4+zuDVR2gdx6TzJv/7WjVr8EUOXFMSX35 VUstmX5w==; Received: from hch by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kl8PA-000230-Ol; Fri, 04 Dec 2020 10:33:36 +0000 Date: Fri, 4 Dec 2020 10:33:36 +0000 From: Christoph Hellwig To: Palmer Dabbelt Cc: dm-devel@redhat.com, agk@redhat.com, snitzer@redhat.com, corbet@lwn.net, song@kernel.org, Palmer Dabbelt , shuah@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-team@android.com Subject: Re: [PATCH v1 0/5] dm: dm-user: New target that proxies BIOs to userspace Message-ID: <20201204103336.GA7374@infradead.org> References: <20201203215859.2719888-1-palmer@dabbelt.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201203215859.2719888-1-palmer@dabbelt.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org What is the advantage over simply using nbd?