md-cluster: convert the completion to wait queue
Previously, we used completion to sync between require dlm lock
and sync_ast, however we will have to expose completion.wait
and completion.done in dlm_lock_sync_interruptible (introduced
later), it is not a common usage for completion, so convert
related things to wait queue.
Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
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