From patchwork Wed Dec 2 05:31:48 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Congyang X-Patchwork-Id: 551176 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 592DB14029E for ; Wed, 2 Dec 2015 16:35:46 +1100 (AEDT) Received: from localhost ([::1]:56310 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a404u-00053H-C2 for incoming@patchwork.ozlabs.org; Wed, 02 Dec 2015 00:35:44 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57143) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a402Z-0000oy-My for qemu-devel@nongnu.org; Wed, 02 Dec 2015 00:33:20 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1a402Y-0002Wm-Hr for qemu-devel@nongnu.org; Wed, 02 Dec 2015 00:33:19 -0500 Received: from [59.151.112.132] (port=5610 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a402V-0002Vq-BW; Wed, 02 Dec 2015 00:33:16 -0500 X-IronPort-AV: E=Sophos;i="5.20,346,1444665600"; d="scan'208";a="1071971" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 02 Dec 2015 13:33:02 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id 426BA41890E1; Wed, 2 Dec 2015 13:32:58 +0800 (CST) Received: from G08FNSTD140052.g08.fujitsu.local (10.167.226.52) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.181.6; Wed, 2 Dec 2015 13:32:57 +0800 From: Wen Congyang To: qemu devel , Fam Zheng , Max Reitz , Paolo Bonzini , Kevin Wolf , Stefan Hajnoczi Date: Wed, 2 Dec 2015 13:31:48 +0800 Message-ID: <1449034311-4094-8-git-send-email-wency@cn.fujitsu.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1449034311-4094-1-git-send-email-wency@cn.fujitsu.com> References: <1449034311-4094-1-git-send-email-wency@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.52] X-yoursite-MailScanner-Information: Please contact the ISP for more information X-yoursite-MailScanner-ID: 426BA41890E1.A86EC X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: wency@cn.fujitsu.com X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 59.151.112.132 Cc: qemu block , Jiang Yunhong , Dong Eddie , "Dr. David Alan Gilbert" , "Michael R. Hines" , Gonglei , zhanghailiang Subject: [Qemu-devel] [Patch v12 resend 07/10] quorum: implement block driver interfaces for block replication 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 Signed-off-by: Wen Congyang Signed-off-by: zhanghailiang Signed-off-by: Gonglei Reviewed-by: Alberto Garcia --- block/quorum.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) diff --git a/block/quorum.c b/block/quorum.c index b7df14b..6fa54f3 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -85,6 +85,8 @@ typedef struct BDRVQuorumState { int bsize; QuorumReadPattern read_pattern; + + int replication_index; /* store which child supports block replication */ } BDRVQuorumState; typedef struct QuorumAIOCB QuorumAIOCB; @@ -949,6 +951,7 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags, s->bsize = s->num_children; g_free(opened); + s->replication_index = -1; goto exit; close_exit: @@ -1148,6 +1151,77 @@ static void quorum_refresh_filename(BlockDriverState *bs, QDict *options) bs->full_open_options = opts; } +static void quorum_start_replication(BlockDriverState *bs, ReplicationMode mode, + Error **errp) +{ + BDRVQuorumState *s = bs->opaque; + int count = 0, i, index; + Error *local_err = NULL; + + /* + * TODO: support REPLICATION_MODE_SECONDARY if we allow secondary + * QEMU becoming primary QEMU. + */ + if (mode != REPLICATION_MODE_PRIMARY) { + error_setg(errp, "The replication mode for quorum should be 'primary'"); + return; + } + + if (s->read_pattern != QUORUM_READ_PATTERN_FIFO) { + error_setg(errp, "Block replication needs read pattern 'fifo'"); + return; + } + + for (i = 0; i < s->num_children; i++) { + bdrv_start_replication(s->children[i]->bs, mode, &local_err); + if (local_err) { + error_free(local_err); + local_err = NULL; + } else { + count++; + index = i; + } + } + + if (count == 0) { + error_setg(errp, "No child supports block replication"); + } else if (count > 1) { + for (i = 0; i < s->num_children; i++) { + bdrv_stop_replication(s->children[i]->bs, false, NULL); + } + error_setg(errp, "Too many children support block replication"); + } else { + s->replication_index = index; + } +} + +static void quorum_do_checkpoint(BlockDriverState *bs, Error **errp) +{ + BDRVQuorumState *s = bs->opaque; + + if (s->replication_index < 0) { + error_setg(errp, "Block replication is not running"); + return; + } + + bdrv_do_checkpoint(s->children[s->replication_index]->bs, errp); +} + +static void quorum_stop_replication(BlockDriverState *bs, bool failover, + Error **errp) +{ + BDRVQuorumState *s = bs->opaque; + + if (s->replication_index < 0) { + error_setg(errp, "Block replication is not running"); + return; + } + + bdrv_stop_replication(s->children[s->replication_index]->bs, failover, + errp); + s->replication_index = -1; +} + static BlockDriver bdrv_quorum = { .format_name = "quorum", .protocol_name = "quorum", @@ -1174,6 +1248,10 @@ static BlockDriver bdrv_quorum = { .is_filter = true, .bdrv_recurse_is_first_non_filter = quorum_recurse_is_first_non_filter, + + .bdrv_start_replication = quorum_start_replication, + .bdrv_do_checkpoint = quorum_do_checkpoint, + .bdrv_stop_replication = quorum_stop_replication, }; static void bdrv_quorum_init(void)