dlm: use kref_put_lock in __put_lkb

This patch will optimize __put_lkb() by using kref_put_lock(). The
function kref_put_lock() will only take the lock if the reference is
going to be zero, if not the lock will never be held.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index a331210..226822f 100644 (file)
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -1268,9 +1268,11 @@ static void kill_lkb(struct kref *kref)
 static int __put_lkb(struct dlm_ls *ls, struct dlm_lkb *lkb)
 {
        uint32_t lkid = lkb->lkb_id;
+       int rv;
 
-       spin_lock(&ls->ls_lkbidr_spin);
-       if (kref_put(&lkb->lkb_ref, kill_lkb)) {
+       rv = kref_put_lock(&lkb->lkb_ref, kill_lkb,
+                          &ls->ls_lkbidr_spin);
+       if (rv) {
                idr_remove(&ls->ls_lkbidr, lkid);
                spin_unlock(&ls->ls_lkbidr_spin);
 
@@ -1280,11 +1282,9 @@ static int __put_lkb(struct dlm_ls *ls, struct dlm_lkb *lkb)
                if (lkb->lkb_lvbptr && is_master_copy(lkb))
                        dlm_free_lvb(lkb->lkb_lvbptr);
                dlm_free_lkb(lkb);
-               return 1;
-       } else {
-               spin_unlock(&ls->ls_lkbidr_spin);
-               return 0;
        }
+
+       return rv;
 }
 
 int dlm_put_lkb(struct dlm_lkb *lkb)