From patchwork Mon Feb 3 19:11:48 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: 316292 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 B5E622C0089 for ; Tue, 4 Feb 2014 07:07:38 +1100 (EST) Received: from localhost ([::1]:49204 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WAOyG-0002VP-4p for incoming@patchwork.ozlabs.org; Mon, 03 Feb 2014 14:14:16 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49165) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WAOw5-0000LO-Fm for qemu-devel@nongnu.org; Mon, 03 Feb 2014 14:12:06 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WAOw0-0002Io-Fy for qemu-devel@nongnu.org; Mon, 03 Feb 2014 14:12:01 -0500 Received: from paradis.irqsave.net ([62.212.105.220]:49056) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WAOvz-0002I9-Ue for qemu-devel@nongnu.org; Mon, 03 Feb 2014 14:11:56 -0500 Received: from localhost.localdomain (laure.irqsave.net [192.168.77.2]) by paradis.irqsave.net (Postfix) with ESMTP id 02D375ED68; Mon, 3 Feb 2014 20:45:25 +0100 (CET) From: =?UTF-8?q?Beno=C3=AEt=20Canet?= To: qemu-devel@nongnu.org Date: Mon, 3 Feb 2014 20:11:48 +0100 Message-Id: <1391454712-14353-10-git-send-email-benoit.canet@irqsave.net> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1391454712-14353-1-git-send-email-benoit.canet@irqsave.net> References: <1391454712-14353-1-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 V14 09/13] quorum: Add quorum_co_get_block_status. 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 --- block/quorum.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/block/quorum.c b/block/quorum.c index 4b726ba..6f7a40d 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -621,6 +621,56 @@ static void quorum_invalidate_cache(BlockDriverState *bs) } } +static int64_t coroutine_fn quorum_co_get_block_status(BlockDriverState *bs, + int64_t sector_num, + int nb_sectors, + int *pnum) +{ + BDRVQuorumState *s = bs->opaque; + QuorumVoteVersion *winner = NULL; + QuorumVotes result_votes, num_votes; + QuorumVoteValue result_value, num_value; + int i, num; + int64_t result = 0; + + QLIST_INIT(&result_votes.vote_list); + QLIST_INIT(&num_votes.vote_list); + result_votes.compare = quorum_64bits_compare; + num_votes.compare = quorum_64bits_compare; + + for (i = 0; i < s->total; i++) { + result = bdrv_get_block_status(s->bs[i], sector_num, nb_sectors, &num); + /* skip failed requests */ + if (result < 0) { + continue; + } + result_value.l = result & BDRV_BLOCK_DATA; + num_value.l = num; + quorum_count_vote(&result_votes, &result_value, i); + quorum_count_vote(&num_votes, &num_value, i); + } + + winner = quorum_get_vote_winner(&result_votes); + if (winner->vote_count < s->threshold) { + result = -EIO; + goto free_exit; + } + result = winner->value.l; + + winner = quorum_get_vote_winner(&num_votes); + if (winner->vote_count < s->threshold) { + result = -EIO; + goto free_exit; + } + *pnum = winner->value.l; + +free_exit: + quorum_free_vote_list(&result_votes); + quorum_free_vote_list(&num_votes); + + return result; +} + static BlockDriver bdrv_quorum = { .format_name = "quorum", .protocol_name = "quorum", @@ -632,6 +682,7 @@ static BlockDriver bdrv_quorum = { .bdrv_aio_readv = quorum_aio_readv, .bdrv_aio_writev = quorum_aio_writev, .bdrv_invalidate_cache = quorum_invalidate_cache, + .bdrv_co_get_block_status = quorum_co_get_block_status, }; static void bdrv_quorum_init(void)