From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sunil Mushran <sunil.mushran@oracle.com>
Date: Mon, 22 Jun 2009 13:26:40 -0700
Subject: [Ocfs2-devel] [PATCH 5/5] ocfs2: Disable orphan scanning for
 local and hard-ro mounts
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Joel Becker wrote:
> On Mon, Jun 22, 2009 at 11:40:07AM -0700, Sunil Mushran wrote:
>> Local and Hard-RO mounts do not need orphan scanning.
> 	I just realized that we hold the os->os_lock around everything
> we do here.  The orphan scan state doesn't need to be atomic_t.

No we don't hold it across all ops. In ocfs2_orphan_scan_stop(), we set
it inactive before taking the mutex. This allows ocfs2_queue_orphan_scan()
to bail out without queuing the tasks. The idea is to prevent umount 
slowdown
- as much as possible.