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quorum: Add quorum_co_flush(). 

Makes a vote to select error if any.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Benoît Canet 2014-02-21 22:21:18 +01:00 committed by Kevin Wolf
parent a28e4c408b
commit 1c508d174d
1 changed files with 28 additions and 0 deletions
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28
block/quorum.c
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@ -629,12 +629,40 @@ static void quorum_invalidate_cache(BlockDriverState *bs)
}
}
static coroutine_fn int quorum_co_flush(BlockDriverState *bs)
{
BDRVQuorumState *s = bs->opaque;
QuorumVoteVersion *winner = NULL;
QuorumVotes error_votes;
QuorumVoteValue result_value;
int i;
int result = 0;
QLIST_INIT(&error_votes.vote_list);
error_votes.compare = quorum_64bits_compare;
for (i = 0; i < s->num_children; i++) {
result = bdrv_co_flush(s->bs[i]);
result_value.l = result;
quorum_count_vote(&error_votes, &result_value, i);
}
winner = quorum_get_vote_winner(&error_votes);
result = winner->value.l;
quorum_free_vote_list(&error_votes);
return result;
}
static BlockDriver bdrv_quorum = {
.format_name = "quorum",
.protocol_name = "quorum",
.instance_size = sizeof(BDRVQuorumState),
.bdrv_co_flush_to_disk = quorum_co_flush,
.bdrv_getlength = quorum_getlength,
.bdrv_aio_readv = quorum_aio_readv,