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- Log -----------------------------------------------------------------
commit 5fae9f37a128182ee8e69cdf99c35c641d3a05eb
Author: Tao Ma <tao.ma at oracle.com>
Date:   Mon Sep 13 12:30:29 2010 -0700

    ocfs2: Move orphan scan work to ocfs2_wq.
    
    Mainline Commit 40f165f416bde747d85cdf71bc9dde700912f71f
    We used to let orphan scan work in the default work queue,
    but there is a corner case which will make the system deadlock.
    The scenario is like this:
    1. set heartbeat threadshold to 200. this will allow us to have a
       great chance to have a orphan scan work before our quorum decision.
    2. mount node 1.
    3. after 1~2 minutes, mount node 2(in order to make the bug easier
       to reproduce, better add maxcpus=1 to kernel command line).
    4. node 1 do orphan scan work.
    5. node 2 do orphan scan work.
    6. node 1 do orphan scan work. After this, node 1 hold the orphan scan
       lock while node 2 know node 1 is the master.
    7. ifdown eth2 in node 2(eth2 is what we do ocfs2 interconnection).
    
    Now when node 2 begins orphan scan, the system queue is blocked.
    
    The root cause is that both orphan scan work and quorum decision work
    will use the system event work queue. orphan scan has a chance of
    blocking the event work queue(in dlm_wait_for_node_death) so that there
    is no chance for quorum decision work to proceed.
    
    This patch resolve it by moving orphan scan work to ocfs2_wq.
    
    Signed-off-by: Tao Ma <tao.ma at oracle.com>
    Signed-off-by: Joel Becker <joel.becker at oracle.com>

-----------------------------------------------------------------------

Summary of changes:
 fs/ocfs2/journal.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)


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