From patchwork Mon Aug 20 11:48:03 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benoit Canet X-Patchwork-Id: 178765 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id AB1BE2C0078 for ; Mon, 20 Aug 2012 22:23:20 +1000 (EST) Received: from localhost ([::1]:40638 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T3QU0-0006gT-4l for incoming@patchwork.ozlabs.org; Mon, 20 Aug 2012 07:49:24 -0400 Received: from eggs.gnu.org ([208.118.235.92]:34278) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T3QT8-00051J-U8 for qemu-devel@nongnu.org; Mon, 20 Aug 2012 07:48:31 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1T3QT7-0004EY-TQ for qemu-devel@nongnu.org; Mon, 20 Aug 2012 07:48:30 -0400 Received: from mail-we0-f173.google.com ([74.125.82.173]:61973) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T3QT7-0004B0-N7 for qemu-devel@nongnu.org; Mon, 20 Aug 2012 07:48:29 -0400 Received: by mail-we0-f173.google.com with SMTP id z53so3878406wey.4 for ; Mon, 20 Aug 2012 04:48:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; bh=utZh5F4I4bxSeh3DsIEatGsVk8W5rSk77ledyEDpkqk=; b=TJKrJaCyhv6KfGnxLzpcgYz96FTSVpZWpnfyJU430vnK3/DVO1BqTcoszg2B0yqMkS ms7va2mTAZlPpXus6aR7GRhiY4+tAqN0f+as15aTi/yK7YsVBmSlGMOxdLIvxwa7eo++ J7+nQJpiDi9dRfkCjt9Kc92uQp8De2TlpWQQ/J6Rf+dwD8HGw/GFCCgtciE2ag//Te+q J9GGVeW83izbDsjqtbNt8oPot/vqo4S8bDmZXjxV6EdgaFliK9tUSGKx1kt2S33nTmKg TcJD/z9xaLlnISmTM8zbCbtdNj7wMKlt2TyzORmYCcWsy/IAvitGZtVbeVz+N21GWpnu ZGTw== Received: by 10.216.137.32 with SMTP id x32mr6746281wei.95.1345463309167; Mon, 20 Aug 2012 04:48:29 -0700 (PDT) Received: from Laure.box.in.irqsave.net (paradis.irqsave.net. [109.190.18.76]) by mx.google.com with ESMTPS id k20sm27703494wiv.11.2012.08.20.04.48.27 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 20 Aug 2012 04:48:28 -0700 (PDT) From: "=?UTF-8?q?Beno=C3=AEt=20Canet?=" To: qemu-devel@nongnu.org Date: Mon, 20 Aug 2012 13:48:03 +0200 Message-Id: <1345463283-9684-10-git-send-email-benoit@irqsave.net> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1345463283-9684-1-git-send-email-benoit@irqsave.net> References: <1345463283-9684-1-git-send-email-benoit@irqsave.net> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 74.125.82.173 Cc: kwolf@redhat.com, stefanha@linux.vnet.ibm.com, blauwirbel@gmail.com, anthony@codemonkey.ws, pbonzini@redhat.com, eblake@redhat.com, afaerber@suse.de, =?UTF-8?q?Beno=C3=AEt=20Canet?= Subject: [Qemu-devel] [RFC V4 9/9] quorum: Add quorum_getlength(). 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: Benoit Canet --- block/quorum.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/block/quorum.c b/block/quorum.c index a909ce2..7bd6f0e 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -525,12 +525,42 @@ static coroutine_fn int quorum_co_flush(BlockDriverState *bs) return 0; } +static int64_t quorum_getlength(BlockDriverState *bs) +{ + BDRVQuorumState *s = bs->opaque; + QuorumVoteVersion *candidate, *winner = NULL; + QuorumVotes votes; + int64_t value; + int i; + + QLIST_INIT(&votes.vote_list); + for (i = 0; i < s->total; i++) { + quorum_count_vote(&votes, (unsigned long) bdrv_getlength(s->bs[i]), i); + } + + /* vote to select the most represented version */ + i = 0; + QLIST_FOREACH(candidate, &votes.vote_list, next) { + if (candidate->vote_count > i) { + i = candidate->vote_count; + winner = candidate; + } + } + + value = (int64_t) winner->value; + quorum_free_vote_list(&votes); + + return value; +} + static BlockDriver bdrv_quorum = { .format_name = "quorum", .protocol_name = "quorum", .instance_size = sizeof(BDRVQuorumState), + .bdrv_getlength = quorum_getlength, + .bdrv_file_open = quorum_open, .bdrv_close = quorum_close, .bdrv_co_flush_to_disk = quorum_co_flush,