[sheepdog] [PATCH] sheep: simplify the cluster driver interface for blocking events

[Liu Yuan]

On 06/05/2012 08:07 PM, Christoph Hellwig wrote:

> Let sd_block_handler handle the fine details of how to handle an incoming
> blocking event.  By passing the sender node structure we can easily handle
> ignoring it on other nodes, and by keeping a local operation in progress
> flag in group.c we can replace the callbacked flag in the on the wire
> events with a way simpler mechanism.
> 
> The only slightly complicated bit is that zk_notify_blocked in the zookeeper
> backend can now go negative for a short period of time, so we explicitly
> have to check for it beeing positive in two places.


By looking at the code detail, I come up with one patch to completely
remove unblock/block/sd_block_hander().

Thanks,
Yuan