From mboxrd@z Thu Jan 1 00:00:00 1970 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) From: "=?UTF-8?q?Beno=C3=AEt=20Canet?=" Date: Mon, 20 Aug 2012 13:48:03 +0200 Message-Id: <1345463283-9684-10-git-send-email-benoit@irqsave.net> In-Reply-To: <1345463283-9684-1-git-send-email-benoit@irqsave.net> References: <1345463283-9684-1-git-send-email-benoit@irqsave.net> Subject: [Qemu-devel] [RFC V4 9/9] quorum: Add quorum_getlength(). List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org 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?= 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, -- 1.7.9.5