ocfs2: purge lockres' sooner

Immediately purge a lockress that the local node is not the master of.

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

1 files changed, 35 insertions, 2 deletions

diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index 71302b90daf5..76526ea95bb2 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -54,6 +54,8 @@
 #include "cluster/masklog.h"
 
 static int dlm_thread(void *data);
+static void dlm_purge_lockres_now(struct dlm_ctxt *dlm,
+                                  struct dlm_lock_resource *lockres);
 
 static void dlm_flush_asts(struct dlm_ctxt *dlm);
 
@@ -111,10 +113,23 @@ void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
                         res->last_used = jiffies;
                         list_add_tail(&res->purge, &dlm->purge_list);
                         dlm->purge_count++;
+
+                        /* if this node is not the owner, there is
+                         * no way to keep track of who the owner could be.
+                         * unhash it to avoid serious problems. */
+                        if (res->owner != dlm->node_num) {
+                                mlog(0, "%s:%.*s: doing immediate "
+                                     "purge of lockres owned by %u\n",
+                                     dlm->name, res->lockname.len,
+                                     res->lockname.name, res->owner);
+
+                                dlm_purge_lockres_now(dlm, res);
+                        }
                 }
         } else if (!list_empty(&res->purge)) {
-                mlog(0, "removing lockres %.*s from purge list\n",
-                     res->lockname.len, res->lockname.name);
+                mlog(0, "removing lockres %.*s from purge list, "
+                     "owner=%u\n", res->lockname.len, res->lockname.name,
+                     res->owner);
 
                 list_del_init(&res->purge);
                 dlm->purge_count--;
@@ -180,6 +195,24 @@ finish:
         __dlm_unhash_lockres(lockres);
 }
 
+/* make an unused lockres go away immediately.
+ * as soon as the dlm spinlock is dropped, this lockres
+ * will not be found. kfree still happens on last put. */
+static void dlm_purge_lockres_now(struct dlm_ctxt *dlm,
+                                  struct dlm_lock_resource *lockres)
+{
+        assert_spin_locked(&dlm->spinlock);
+        assert_spin_locked(&lockres->spinlock);
+
+        BUG_ON(!__dlm_lockres_unused(lockres));
+
+        if (!list_empty(&lockres->purge)) {
+                list_del_init(&lockres->purge);
+                dlm->purge_count--;
+        }
+        __dlm_unhash_lockres(lockres);
+}
+
 static void dlm_run_purge_list(struct dlm_ctxt *dlm,
                                int purge_now)
 {