Signed-off-by: Benoit Canet <ben...@irqsave.net>
---
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
