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 bf87391..9e05244 100644 (file)
--- 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 81bd240..6ee8b32 100644 (file)
--- 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 22bb58a..71302b9 100644 (file)
--- 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) &&