From mboxrd@z Thu Jan 1 00:00:00 1970 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 From: =?UTF-8?q?Beno=C3=AEt=20Canet?= Date: Wed, 2 Oct 2013 14:39:22 +0200 Message-Id: <1380717564-11098-10-git-send-email-benoit@irqsave.net> In-Reply-To: <1380717564-11098-1-git-send-email-benoit@irqsave.net> References: <1380717564-11098-1-git-send-email-benoit@irqsave.net> Subject: [Qemu-devel] [PATCH V9 09/11] quorum: Add quorum_co_get_block_status. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, =?UTF-8?q?Beno=C3=AEt=20Canet?= , stefanha@redhat.com 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) -- 1.8.1.2