linux-kernel - [ 19/53] ocfs2: unlock super lock if lockres refresh failed

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Message-Id: <20130226235621.834415204@linuxfoundation.org>
Date:	Tue, 26 Feb 2013 15:57:48 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Junxiao Bi <junxiao.bi@...cle.com>,
	Joel Becker <jlbec@...lplan.org>,
	Mark Fasheh <mfasheh@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 19/53] ocfs2: unlock super lock if lockres refresh failed

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

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

From: Junxiao Bi <junxiao.bi@...cle.com>

commit 3278bb748d2437eb1464765f36429e5d6aa91c38 upstream.

If lockres refresh failed, the super lock will never be released which
will cause some processes on other cluster nodes hung forever.

Signed-off-by: Junxiao Bi <junxiao.bi@...cle.com>
Cc: Joel Becker <jlbec@...lplan.org>
Cc: Mark Fasheh <mfasheh@...e.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ocfs2/dlmglue.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -2539,6 +2539,7 @@ int ocfs2_super_lock(struct ocfs2_super
 	 * everything is up to the caller :) */
 	status = ocfs2_should_refresh_lock_res(lockres);
 	if (status < 0) {
+		ocfs2_cluster_unlock(osb, lockres, level);
 		mlog_errno(status);
 		goto bail;
 	}
@@ -2547,8 +2548,10 @@ int ocfs2_super_lock(struct ocfs2_super
 
 		ocfs2_complete_lock_res_refresh(lockres, status);
 
-		if (status < 0)
+		if (status < 0) {
+			ocfs2_cluster_unlock(osb, lockres, level);
 			mlog_errno(status);
+		}
 		ocfs2_track_lock_refresh(lockres);
 	}
 bail:


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