From patchwork Fri Apr 5 16:56:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Shinkevich X-Patchwork-Id: 10887665 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1AE5D13B5 for ; Fri, 5 Apr 2019 17:22:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0143B27F89 for ; Fri, 5 Apr 2019 17:22:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E6FF828AF7; Fri, 5 Apr 2019 17:22:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 926B527F89 for ; Fri, 5 Apr 2019 17:22:57 +0000 (UTC) Received: from localhost ([127.0.0.1]:44871 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hCSYK-0003DF-KG for patchwork-qemu-devel@patchwork.kernel.org; Fri, 05 Apr 2019 13:22:56 -0400 Received: from eggs.gnu.org ([209.51.188.92]:51025) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hCSXg-0002oH-06 for qemu-devel@nongnu.org; Fri, 05 Apr 2019 13:22:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hCSXe-0003s2-Sz for qemu-devel@nongnu.org; Fri, 05 Apr 2019 13:22:15 -0400 Received: from relay.sw.ru ([185.231.240.75]:33032) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hCSWU-00031q-23; Fri, 05 Apr 2019 13:22:14 -0400 Received: from [172.16.25.136] (helo=localhost.sw.ru) by relay.sw.ru with esmtp (Exim 4.91) (envelope-from ) id 1hCS8Z-0008Mk-QH; Fri, 05 Apr 2019 19:56:20 +0300 From: Andrey Shinkevich To: qemu-devel@nongnu.org, qemu-block@nongnu.org Date: Fri, 5 Apr 2019 19:56:16 +0300 Message-Id: <1554483379-682051-1-git-send-email-andrey.shinkevich@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH v3 0/3] block/stream: get rid of the base X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: fam@euphon.net, kwolf@redhat.com, vsementsov@virtuozzo.com, berto@igalia.com, mreitz@redhat.com, stefanha@redhat.com, andrey.shinkevich@virtuozzo.com, den@openvz.org, jsnow@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP This series introduces a bottom intermediate node that eliminates the dependency on the base that may change while stream job is running. It happens when stream/commit parallel jobs are running on the same backing chain. The base node of the stream job may be a top node of the parallel commit job and can change before the stream job is completed. We avoid that dependency by introducing the bottom node. v3: bottom = bdrv_find_overlay() moved into the stream_start() v2: The function bdrv_find_overlay() with the same functionality has been used in the qmp_block_stream() to find a bottom node. The algorithm in the bdrv_do_is_allocated_above() was simplified. The commit messages were modified. Discussed in the e-mail threads with the message IDs <1553866154-257311-1-git-send-email-andrey.shinkevich@virtuozzo.com> <1550762799-830661-1-git-send-email-andrey.shinkevich@virtuozzo.com> <1554120365-39119-1-git-send-email-andrey.shinkevich@virtuozzo.com> Andrey Shinkevich (3): block: include base when checking image chain for block allocation block/stream: refactor stream_run: drop goto block/stream: introduce a bottom node block/io.c | 33 ++++++++++++++++++++---- block/stream.c | 69 +++++++++++++++++++++++++------------------------- block/trace-events | 2 +- include/block/block.h | 4 +++ tests/qemu-iotests/245 | 4 +-- 5 files changed, 69 insertions(+), 43 deletions(-)