From patchwork Tue Jan 28 16:52:42 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Beno=C3=AEt_Canet?= X-Patchwork-Id: 314776 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id DD57B2C0A58 for ; Wed, 29 Jan 2014 03:54:43 +1100 (EST) Received: from localhost ([::1]:38251 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W8Bvt-0006FO-GF for incoming@patchwork.ozlabs.org; Tue, 28 Jan 2014 11:54:41 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35121) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W8BuO-0004ll-Dk for qemu-devel@nongnu.org; Tue, 28 Jan 2014 11:53:13 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1W8BuG-00012B-1U for qemu-devel@nongnu.org; Tue, 28 Jan 2014 11:53:08 -0500 Received: from paradis.irqsave.net ([62.212.105.220]:48532) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W8BuF-00011f-LV for qemu-devel@nongnu.org; Tue, 28 Jan 2014 11:52:59 -0500 Received: from localhost.localdomain (laure.irqsave.net [192.168.77.2]) by paradis.irqsave.net (Postfix) with ESMTP id 2745C5CED8; Tue, 28 Jan 2014 18:23:33 +0100 (CET) From: =?UTF-8?q?Beno=C3=AEt=20Canet?= To: qemu-devel@nongnu.org Date: Tue, 28 Jan 2014 17:52:42 +0100 Message-Id: <1390927974-31325-2-git-send-email-benoit.canet@irqsave.net> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1390927974-31325-1-git-send-email-benoit.canet@irqsave.net> References: <1390927974-31325-1-git-send-email-benoit.canet@irqsave.net> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 62.212.105.220 Cc: kwolf@redhat.com, =?UTF-8?q?Beno=C3=AEt=20Canet?= , stefanha@redhat.com, mreitz@redhat.com Subject: [Qemu-devel] [PATCH V10 01/13] quorum: Create quorum.c, add QuorumSingleAIOCB and QuorumAIOCB. X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Benoît Canet Signed-off-by: Benoit Canet Reviewed-by: Max Reitz --- block/Makefile.objs | 1 + block/quorum.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 55 insertions(+) create mode 100644 block/quorum.c diff --git a/block/Makefile.objs b/block/Makefile.objs index 4e8c91e..a2650b9 100644 --- a/block/Makefile.objs +++ b/block/Makefile.objs @@ -3,6 +3,7 @@ block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-c block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o block-obj-y += qed-check.o block-obj-$(CONFIG_VHDX) += vhdx.o vhdx-endian.o vhdx-log.o +block-obj-y += quorum.o block-obj-y += parallels.o blkdebug.o blkverify.o block-obj-y += snapshot.o qapi.o block-obj-$(CONFIG_WIN32) += raw-win32.o win32-aio.o diff --git a/block/quorum.c b/block/quorum.c new file mode 100644 index 0000000..1695f04 --- /dev/null +++ b/block/quorum.c @@ -0,0 +1,54 @@ +/* + * Quorum Block filter + * + * Copyright (C) 2012-2013 Nodalink, SARL. + * + * Author: + * Benoît Canet + * + * Based on the design and code of blkverify.c (Copyright (C) 2010 IBM, Corp) + * and blkmirror.c (Copyright (C) 2011 Red Hat, Inc). + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "block/block_int.h" + +typedef struct QuorumAIOCB QuorumAIOCB; + +/* Quorum will create one instance of the following structure per operation it + * performs on its children. + * So for each read/write operation coming from the upper layer there will be + * $children_count QuorumSingleAIOCB. + */ +typedef struct QuorumSingleAIOCB { + BlockDriverAIOCB *aiocb; + QEMUIOVector qiov; + uint8_t *buf; + int ret; + QuorumAIOCB *parent; +} QuorumSingleAIOCB; + +/* Quorum will use the following structure to track progress of each read/write + * operation received by the upper layer. + * This structure hold pointers to the QuorumSingleAIOCB structures instances + * used to do operations on each children and track overall progress. + */ +struct QuorumAIOCB { + BlockDriverAIOCB common; + + /* Request metadata */ + uint64_t sector_num; + int nb_sectors; + + QEMUIOVector *qiov; /* calling IOV */ + + QuorumSingleAIOCB *aios; /* individual AIOs */ + int count; /* number of completed AIOCB */ + int success_count; /* number of successfully completed AIOCB */ + bool *finished; /* completion signal for cancel */ + + bool is_read; + int vote_ret; +};