ocfs2/dlm: Encapsulate adding and removing of mle from dlm->master_list

This patch encapsulates adding and removing of the mle from the
dlm->master_list. This patch is part of the series of patches that
converts the mle list to a mle hash.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
index bb53714813abb716dca2bb2fe793ee64dd36a8e9..261e26501e57247cd11ff8fa31c95c44ce49d38a 100644 (file)
--- a/fs/ocfs2/dlm/dlmcommon.h
+++ b/fs/ocfs2/dlm/dlmcommon.h
@@ -1008,6 +1008,9 @@ static inline void __dlm_wait_on_lockres(struct dlm_lock_resource *res)
                                          DLM_LOCK_RES_MIGRATING));
 }
 
+void __dlm_unlink_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle);
+void __dlm_insert_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle);
+
 /* create/destroy slab caches */
 int dlm_init_master_caches(void);
 void dlm_destroy_master_caches(void);

diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 0a2813947853dfd68372506b9fb43de894c3d577..0aa4b043f4de8626ac265457bcb9a543de9e22bc 100644 (file)
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -318,6 +318,21 @@ static void dlm_init_mle(struct dlm_master_list_entry *mle,
        __dlm_mle_attach_hb_events(dlm, mle);
 }
 
+void __dlm_unlink_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle)
+{
+       assert_spin_locked(&dlm->spinlock);
+       assert_spin_locked(&dlm->master_lock);
+
+       if (!list_empty(&mle->list))
+               list_del_init(&mle->list);
+}
+
+void __dlm_insert_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle)
+{
+       assert_spin_locked(&dlm->master_lock);
+
+       list_add(&mle->list, &dlm->master_list);
+}
 
 /* returns 1 if found, 0 if not */
 static int dlm_find_mle(struct dlm_ctxt *dlm,
@@ -420,8 +435,7 @@ static void dlm_mle_release(struct kref *kref)
        assert_spin_locked(&dlm->master_lock);
 
        /* remove from list if not already */
-       if (!list_empty(&mle->list))
-               list_del_init(&mle->list);
+       __dlm_unlink_mle(dlm, mle);
 
        /* detach the mle from the domain node up/down events */
        __dlm_mle_detach_hb_events(dlm, mle);
@@ -843,7 +857,7 @@ lookup:
                alloc_mle = NULL;
                dlm_init_mle(mle, DLM_MLE_MASTER, dlm, res, NULL, 0);
                set_bit(dlm->node_num, mle->maybe_map);
-               list_add(&mle->list, &dlm->master_list);
+               __dlm_insert_mle(dlm, mle);
 
                /* still holding the dlm spinlock, check the recovery map
                 * to see if there are any nodes that still need to be 
@@ -1575,7 +1589,7 @@ way_up_top:
                // "add the block.\n");
                dlm_init_mle(mle, DLM_MLE_BLOCK, dlm, NULL, name, namelen);
                set_bit(request->node_idx, mle->maybe_map);
-               list_add(&mle->list, &dlm->master_list);
+               __dlm_insert_mle(dlm, mle);
                response = DLM_MASTER_RESP_NO;
        } else {
                // mlog(0, "mle was found\n");
@@ -1967,7 +1981,7 @@ ok:
                             assert->node_idx, rr, extra_ref, mle->inuse);
                        dlm_print_one_mle(mle);
                }
-               list_del_init(&mle->list);
+               __dlm_unlink_mle(dlm, mle);
                __dlm_mle_detach_hb_events(dlm, mle);
                __dlm_put_mle(mle);
                if (extra_ref) {
@@ -3159,10 +3173,8 @@ static int dlm_add_migration_mle(struct dlm_ctxt *dlm,
                        tmp->master = master;
                        atomic_set(&tmp->woken, 1);
                        wake_up(&tmp->wq);
-                       /* remove it from the list so that only one
-                        * mle will be found */
-                       list_del_init(&tmp->list);
-                       /* this was obviously WRONG.  mle is uninited here.  should be tmp. */
+                       /* remove it so that only one mle will be found */
+                       __dlm_unlink_mle(dlm, tmp);
                        __dlm_mle_detach_hb_events(dlm, tmp);
                        ret = DLM_MIGRATE_RESPONSE_MASTERY_REF;
                        mlog(0, "%s:%.*s: master=%u, newmaster=%u, "
@@ -3181,7 +3193,7 @@ static int dlm_add_migration_mle(struct dlm_ctxt *dlm,
        mle->master = master;
        /* do this for consistency with other mle types */
        set_bit(new_master, mle->maybe_map);
-       list_add(&mle->list, &dlm->master_list);
+       __dlm_insert_mle(dlm, mle);
 
        return ret;
 }
@@ -3264,7 +3276,7 @@ top:
                 * list_head while in list_for_each_safe */
                __dlm_mle_detach_hb_events(dlm, mle);
                spin_lock(&mle->spinlock);
-               list_del_init(&mle->list);
+               __dlm_unlink_mle(dlm, mle);
                atomic_set(&mle->woken, 1);
                spin_unlock(&mle->spinlock);
                wake_up(&mle->wq);