[Qemu-devel] [RFC V5 09/11] quorum: Add quorum_getlength().

[Benoît Canet]

Signed-off-by: Benoit Canet <address@hidden>
---
 block/quorum.c |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/block/quorum.c b/block/quorum.c
index 3fa9d53..09eed84 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -549,12 +549,36 @@ static coroutine_fn int quorum_co_flush(BlockDriverState 
*bs)
     return 0;
 }
 
+static int64_t quorum_getlength(BlockDriverState *bs)
+{
+    BDRVQuorumState *s = bs->opaque;
+    QuorumVoteVersion *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 */
+    winner = quorum_get_vote_winner(&votes);
+
+    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