From: Kurt Hackel <kurt.hackel@oracle.com>
Date: Mon, 1 May 2006 17:57:51 +0000 (-0700)
Subject: ocfs2: dlm recovery / lockres reference count fix
X-Git-Tag: v2.6.18-rc1~594^2~30
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=69d72b066cc5971318d9e29e34289b74cf8a9d22;p=linux-2.6-omap-h63xx.git

ocfs2: dlm recovery / lockres reference count fix

Take a reference on lockres structures while they are on the recovery list.

Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
---

diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
index bf873919b00..9e052445b0b 100644
--- a/fs/ocfs2/dlm/dlmcommon.h
+++ b/fs/ocfs2/dlm/dlmcommon.h
@@ -849,6 +849,7 @@ void dlm_clean_master_list(struct dlm_ctxt *dlm,
 			   u8 dead_node);
 int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
 
+int __dlm_lockres_unused(struct dlm_lock_resource *res);
 
 static inline const char * dlm_lock_mode_name(int mode)
 {
diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index 81bd2400e22..6ee8b324712 100644
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -1758,8 +1758,14 @@ void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
 	struct dlm_lock *lock;
 
 	res->state |= DLM_LOCK_RES_RECOVERING;
-	if (!list_empty(&res->recovering))
+	if (!list_empty(&res->recovering)) {
+		mlog(0,
+		     "Recovering res %s:%.*s, is already on recovery list!\n",
+		     dlm->name, res->lockname.len, res->lockname.name);
 		list_del_init(&res->recovering);
+	}
+	/* We need to hold a reference while on the recovery list */
+	dlm_lockres_get(res);
 	list_add_tail(&res->recovering, &dlm->reco.resources);
 
 	/* find any pending locks and put them back on proper list */
@@ -1848,9 +1854,11 @@ static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
 			spin_lock(&res->spinlock);
 			dlm_change_lockres_owner(dlm, res, new_master);
 			res->state &= ~DLM_LOCK_RES_RECOVERING;
-			__dlm_dirty_lockres(dlm, res);
+			if (!__dlm_lockres_unused(res))
+				__dlm_dirty_lockres(dlm, res);
 			spin_unlock(&res->spinlock);
 			wake_up(&res->wq);
+			dlm_lockres_put(res);
 		}
 	}
 
@@ -1883,11 +1891,13 @@ static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
 					     dlm->name, res->lockname.len,
 					     res->lockname.name, res->owner);
 					list_del_init(&res->recovering);
+					dlm_lockres_put(res);
 				}
 				spin_lock(&res->spinlock);
 				dlm_change_lockres_owner(dlm, res, new_master);
 				res->state &= ~DLM_LOCK_RES_RECOVERING;
-				__dlm_dirty_lockres(dlm, res);
+				if (!__dlm_lockres_unused(res))
+					__dlm_dirty_lockres(dlm, res);
 				spin_unlock(&res->spinlock);
 				wake_up(&res->wq);
 			}
diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index 22bb58a514d..71302b90daf 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -81,7 +81,7 @@ repeat:
 }
 
 
-static int __dlm_lockres_unused(struct dlm_lock_resource *res)
+int __dlm_lockres_unused(struct dlm_lock_resource *res)
 {
 	if (list_empty(&res->granted) &&
 	    list_empty(&res->converting) &&