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[Qemu-devel] [RFC V4 9/9] quorum: Add quorum_getlength().
From: |
Benoît Canet |
Subject: |
[Qemu-devel] [RFC V4 9/9] quorum: Add quorum_getlength(). |
Date: |
Mon, 20 Aug 2012 13:48:03 +0200 |
Signed-off-by: Benoit Canet <address@hidden>
---
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
- [Qemu-devel] [RFC V4 2/9] quorum: Create BDRVQuorumState and BlkDriver and do init., (continued)
- [Qemu-devel] [RFC V4 5/9] blkverify: Extract qemu_iovec_clone() and qemu_iovec_compare() from blkverify., Benoît Canet, 2012/08/20
- [Qemu-devel] [RFC V4 4/9] quorum: Add quorum_aio_writev and its dependencies., Benoît Canet, 2012/08/20
- [Qemu-devel] [RFC V4 6/9] quorum: Add quorum_co_flush()., Benoît Canet, 2012/08/20
- [Qemu-devel] [RFC V4 7/9] quorum: Add quorum_aio_readv., Benoît Canet, 2012/08/20
- [Qemu-devel] [RFC V4 8/9] quorum: Add quorum mechanism., Benoît Canet, 2012/08/20
- [Qemu-devel] [RFC V4 9/9] quorum: Add quorum_getlength().,
Benoît Canet <=