On 08/01/2016 06:29 PM, Shaohua Li wrote:
On Thu, Jul 28, 2016 at 02:16:50AM -0400, Guoqing Jiang wrote:
When one node is perform resync or recovery, other nodes
can't get resync lock and could block for a while before
it holds the lock, so we can't stop array immediately for
this scenario.
To make array could be stop quickly, we check MD_CLOSING
in dlm_lock_sync_interruptible to make us can interrupt
the lock request.
if the thread is waiting for the resync lock and you set MD_CLOSING, where do
you wake up the thread?
If array needs to do resync, it would call md_cluster_ops->resync_start
within md_do_sync. And since MD_CLOSING is set when stop md, we
can see do_md_stop would wake up sync_thread.
Thanks,
Guoqing
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