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=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 EA825C7618F for ; Mon, 15 Jul 2019 20:20:14 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BB87621848 for ; Mon, 15 Jul 2019 20:20:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BB87621848 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:42604 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hn7SH-00054b-Sl for qemu-devel@archiver.kernel.org; Mon, 15 Jul 2019 16:20:13 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55216) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hn7S6-0004dt-GU for qemu-devel@nongnu.org; Mon, 15 Jul 2019 16:20:03 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hn7S5-0007OD-Es for qemu-devel@nongnu.org; Mon, 15 Jul 2019 16:20:02 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47010) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hn7S3-0007LZ-Eq; Mon, 15 Jul 2019 16:19:59 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1BE73C036744; Mon, 15 Jul 2019 20:19:57 +0000 (UTC) Received: from localhost (ovpn-117-120.ams2.redhat.com [10.36.117.120]) by smtp.corp.redhat.com (Postfix) with ESMTP id 50F21600C1; Mon, 15 Jul 2019 20:19:51 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Date: Mon, 15 Jul 2019 21:19:47 +0100 Message-Id: <20190715201950.9444-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Mon, 15 Jul 2019 20:19:57 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 0/3] block/io_uring: fix EINTR and resubmit short reads X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-block@nongnu.org, Max Reitz , Stefan Hajnoczi , Stefan Hajnoczi , Julia Suvorova , Aarushi Mehta Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Short reads are possible with cache=3Dwriteback (see Patch 3 for details)= . Handle this by resubmitting requests until the read is completed. Patch 1 adds trace events useful for debugging io_uring. Patch 2 fixes EINTR. This lays the groundwork for resubmitting requests = in Patch 3. Aarushi: Feel free to squash this into your patch series if you are happy= with the code, I don't mind if the authorship information is lost. After appl= ying these patches I can successfully boot a Fedora 30 guest qcow2 file with cache=3Dwriteback. Based-on: <20190610134905.22294-1-mehta.aaru20@gmail.com> Stefan Hajnoczi (3): block/io_uring: add submission and completion trace events block/io_uring: fix EINTR request resubmission block/io_uring: resubmit short buffered reads block/io_uring.c | 136 ++++++++++++++++++++++++++++++++++----------- block/trace-events | 6 +- 2 files changed, 108 insertions(+), 34 deletions(-) --=20 2.21.0