From patchwork Wed Oct 2 12:39:22 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Beno=C3=AEt_Canet?= X-Patchwork-Id: 279731 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)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 5AF772C007E for ; Wed, 2 Oct 2013 22:45:13 +1000 (EST) Received: from localhost ([::1]:35864 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VRLni-0005zA-Kb for incoming@patchwork.ozlabs.org; Wed, 02 Oct 2013 08:45:10 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55935) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VRLjJ-0007aV-NI for qemu-devel@nongnu.org; Wed, 02 Oct 2013 08:40:42 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VRLjE-0007kz-IB for qemu-devel@nongnu.org; Wed, 02 Oct 2013 08:40:37 -0400 Received: from nodalink.pck.nerim.net ([62.212.105.220]:42258 helo=paradis.irqsave.net) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VRLjE-0007jp-3t for qemu-devel@nongnu.org; Wed, 02 Oct 2013 08:40:32 -0400 Received: by paradis.irqsave.net (Postfix, from userid 1002) id 753CD8746C6; Wed, 2 Oct 2013 14:40:31 +0200 (CEST) Received: from Laure.example.org (unknown [192.168.77.20]) by paradis.irqsave.net (Postfix) with ESMTP id A293B8746D2; Wed, 2 Oct 2013 14:39:25 +0200 (CEST) From: =?UTF-8?q?Beno=C3=AEt=20Canet?= To: qemu-devel@nongnu.org Date: Wed, 2 Oct 2013 14:39:22 +0200 Message-Id: <1380717564-11098-10-git-send-email-benoit@irqsave.net> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1380717564-11098-1-git-send-email-benoit@irqsave.net> References: <1380717564-11098-1-git-send-email-benoit@irqsave.net> 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 Subject: [Qemu-devel] [PATCH V9 09/11] 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 Signed-off-by: Benoit Canet --- block/quorum.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/block/quorum.c b/block/quorum.c index 223ad22..084d030 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -171,6 +171,22 @@ static int quorum_sha256_compare(QuorumVoteValue *a, QuorumVoteValue *b) return memcmp(a->h, b->h, HASH_LENGTH); } +static int quorum_64bits_compare(QuorumVoteValue *a, QuorumVoteValue *b) +{ + int64_t i = a->l; + int64_t j = b->l; + + if (i < j) { + return -1; + } + + if (i > j) { + return 1; + } + + return 0; +} + static QuorumAIOCB *quorum_aio_get(BDRVQuorumState *s, BlockDriverState *bs, QEMUIOVector *qiov, @@ -575,6 +591,56 @@ 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); + result = winner->value.l; + if (winner->vote_count < s->threshold) { + result = -ERANGE; + goto free_exit; + } + + winner = quorum_get_vote_winner(&num_votes); + if (winner->vote_count < s->threshold) { + result = -ERANGE; + 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", @@ -586,6 +652,7 @@ 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)