From patchwork Tue Nov 3 10:58:46 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Congyang X-Patchwork-Id: 539314 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 085431402BF for ; Tue, 3 Nov 2015 22:06:52 +1100 (AEDT) Received: from localhost ([::1]:47059 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZtZQQ-0006gz-8T for incoming@patchwork.ozlabs.org; Tue, 03 Nov 2015 06:06:50 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37458) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZtZKG-0004Yy-Nr for qemu-devel@nongnu.org; Tue, 03 Nov 2015 06:00:36 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZtZKB-0002k8-MO for qemu-devel@nongnu.org; Tue, 03 Nov 2015 06:00:28 -0500 Received: from [59.151.112.132] (port=5716 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZtZKB-0002hQ-6D; Tue, 03 Nov 2015 06:00:23 -0500 Received: from bogon (HELO edo.cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 03 Nov 2015 19:00:04 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (localhost.localdomain [127.0.0.1]) by edo.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id tA3AxgER019089; Tue, 3 Nov 2015 18:59:42 +0800 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; Tue, 3 Nov 2015 19:00:18 +0800 From: Wen Congyang To: qemu devel , Fam Zheng , Max Reitz , Paolo Bonzini , Stefan Hajnoczi Date: Tue, 3 Nov 2015 18:58:46 +0800 Message-ID: <1446548329-17475-10-git-send-email-wency@cn.fujitsu.com> X-Mailer: git-send-email 2.4.3 In-Reply-To: <1446548329-17475-1-git-send-email-wency@cn.fujitsu.com> References: <1446548329-17475-1-git-send-email-wency@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.52] X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 59.151.112.132 Cc: Kevin Wolf , qemu block , Jiang Yunhong , Dong Eddie , "Dr. David Alan Gilbert" , "Michael R. Hines" , Gonglei , zhanghailiang Subject: [Qemu-devel] [PATCH v11 09/12] 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 79afb20..7cb5f91 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -82,6 +82,8 @@ typedef struct BDRVQuorumState { */ QuorumReadPattern read_pattern; + + int replication_index; /* store which child supports block replication */ } BDRVQuorumState; typedef struct QuorumAIOCB QuorumAIOCB; @@ -943,6 +945,7 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags, } g_free(opened); + s->replication_index = -1; goto exit; close_exit: @@ -1083,6 +1086,77 @@ static void quorum_refresh_filename(BlockDriverState *bs) 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", @@ -1109,6 +1183,10 @@ 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)