[Ocfs2-devel] ocfs2: Question for ocfs2_recovery_thread

[Joseph Qi]

On 2013/5/18 21:26, Sunil Mushran wrote:
> The first node that gets the lock will do the actual recovery. The others will get the lock and see a clean journal and skip the recovery. A thread should never error out if it fails to get the lock. It should try and try again.
> 
> On May 17, 2013, at 11:27 PM, Joseph Qi <joseph.qi at huawei.com> wrote:
> 
>> Hi,
>> Once there is node down in the cluster, ocfs2_recovery_thread will be
>> triggered on each node. These threads then do the down node recovery by
>> get super lock.
>> I have several questions on this:
>> 1) Why each node has to run such a thread? We know at last one node can
>> get the super lock and do the actual recovery.
>> 2) If this thread is running but something error occurred, take
>> ocfs2_super_lock failed for example, the thread will exit without
>> clearing recovery map, will it cause other threads still waiting for
>> recovery in ocfs2_wait_for_recovery?
>>
> 
> 
But when error occurs and goes to bail, and the restart logic will not
run. Codes like below:
...
	status = ocfs2_wait_on_mount(osb);
	if (status < 0) {
		goto bail;
	}

	rm_quota = kzalloc(osb->max_slots * sizeof(int), GFP_NOFS);
	if (!rm_quota) {
		status = -ENOMEM;
		goto bail;
	}
restart:
	status = ocfs2_super_lock(osb, 1);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}
...
	if (!status && !ocfs2_recovery_completed(osb)) {
		mutex_unlock(&osb->recovery_lock);
		goto restart;
	}