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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 2F362C43461 for ; Tue, 8 Sep 2020 15:33:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D00352245B for ; Tue, 8 Sep 2020 15:33:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="pgKsLb/a" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730478AbgIHPcx (ORCPT ); Tue, 8 Sep 2020 11:32:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730283AbgIHPYH (ORCPT ); Tue, 8 Sep 2020 11:24:07 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 83CC5C08C5ED; Tue, 8 Sep 2020 08:18:15 -0700 (PDT) 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=hyoD9QmcI5oiNUeN3ikrG7yLEGezAUx3TNWi/z6zbWI=; b=pgKsLb/aVboApOOdFqn5zDVWgG Snx9karx64Rd7CkJliDojwf8qA6Vh8rEzXBdRiZ8IQONB/Feeejk7hc6VphgfXzIdXRcmZqmEQSAj 5+cj7IfmEd2fNt84yK5+jgEZ9BGWTAAdzs+64KItaB1DXE5Kc0WjadecA0kyx3wIm0Py7BPINIWFK K6h868Fkl8wsC8soHGKMlfCMsIA1vDWjYdnTq579hK/y7Muua+Oimtkv6XxgFIkUy04p3qROWpPGg BhIPKafV1qYxUpaG3uBP5qGUxTfc4x7kGtPFdj3u0f6h5QbDHQSj5enIFCSO0WKCv3+p/khC8QmVr ujFJjjAA==; Received: from hch by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kFfNh-0004N6-CU; Tue, 08 Sep 2020 15:18:01 +0000 Date: Tue, 8 Sep 2020 16:18:01 +0100 From: "hch@infradead.org" To: Kanchan Joshi Cc: "hch@infradead.org" , Damien Le Moal , Jens Axboe , Pavel Begunkov , Kanchan Joshi , "viro@zeniv.linux.org.uk" , "bcrl@kvack.org" , Matthew Wilcox , "linux-fsdevel@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-aio@kvack.org" , "io-uring@vger.kernel.org" , "linux-block@vger.kernel.org" , "linux-api@vger.kernel.org" , SelvaKumar S , Nitesh Shetty , Javier Gonzalez , Johannes Thumshirn , Naohiro Aota Subject: Re: [PATCH v4 6/6] io_uring: add support for zone-append Message-ID: <20200908151801.GA16742@infradead.org> References: <20200731091416.GA29634@infradead.org> <20200731094135.GA4104@infradead.org> <20200731125110.GA11500@infradead.org> <20200814081411.GA16943@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On Mon, Sep 07, 2020 at 12:31:42PM +0530, Kanchan Joshi wrote: > But there are use-cases which benefit from supporting zone-append on > raw block-dev path. > Certain user-space log-structured/cow FS/DB will use the device that > way. Aerospike is one example. > Pass-through is synchronous, and we lose the ability to use io-uring. So use zonefs, which is designed exactly for that use case.