linux-kernel - [PATCH 3.16.y-ckt 099/129] ocfs2/dlm: clear refmap bit of recovery lock while doing local recovery cleanup

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Message-Id: <1456482100-4667-100-git-send-email-luis.henriques@canonical.com>
Date:	Fri, 26 Feb 2016 10:21:10 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	xuejiufei <xuejiufei@...wei.com>, Mark Fasheh <mfasheh@...e.de>,
	Joel Becker <jlbec@...lplan.org>,
	Junxiao Bi <junxiao.bi@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 099/129] ocfs2/dlm: clear refmap bit of recovery lock while doing local recovery cleanup

3.16.7-ckt25 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: xuejiufei <xuejiufei@...wei.com>

commit c95a51807b730e4681e2ecbdfd669ca52601959e upstream.

When recovery master down, dlm_do_local_recovery_cleanup() only remove
the $RECOVERY lock owned by dead node, but do not clear the refmap bit.
Which will make umount thread falling in dead loop migrating $RECOVERY
to the dead node.

Signed-off-by: xuejiufei <xuejiufei@...wei.com>
Reviewed-by: Joseph Qi <joseph.qi@...wei.com>
Cc: Mark Fasheh <mfasheh@...e.de>
Cc: Joel Becker <jlbec@...lplan.org>
Cc: Junxiao Bi <junxiao.bi@...cle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 fs/ocfs2/dlm/dlmrecovery.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index 5084ce856879..539b577740c7 100644
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -2345,6 +2345,8 @@ static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node)
 						break;
 					}
 				}
+				dlm_lockres_clear_refmap_bit(dlm, res,
+						dead_node);
 				spin_unlock(&res->spinlock);
 				continue;
 			}