LU-718 mds: new MDS layer.

[fs/lustre-release.git] / lustre / obdclass / lu_object.c

diff --git a/lustre/obdclass/lu_object.c b/lustre/obdclass/lu_object.c
index dd46c1b..8443bc2 100644 (file)
--- a/lustre/obdclass/lu_object.c
+++ b/lustre/obdclass/lu_object.c
@@ -718,20 +718,22 @@ static CFS_LIST_HEAD(lu_device_types);
 
 int lu_device_type_init(struct lu_device_type *ldt)
 {
-        int result;
+       int result = 0;
 
-        CFS_INIT_LIST_HEAD(&ldt->ldt_linkage);
-        result = ldt->ldt_ops->ldto_init(ldt);
-        if (result == 0)
-                cfs_list_add(&ldt->ldt_linkage, &lu_device_types);
-        return result;
+       CFS_INIT_LIST_HEAD(&ldt->ldt_linkage);
+       if (ldt->ldt_ops->ldto_init)
+               result = ldt->ldt_ops->ldto_init(ldt);
+       if (result == 0)
+               cfs_list_add(&ldt->ldt_linkage, &lu_device_types);
+       return result;
 }
 EXPORT_SYMBOL(lu_device_type_init);
 
 void lu_device_type_fini(struct lu_device_type *ldt)
 {
-        cfs_list_del_init(&ldt->ldt_linkage);
-        ldt->ldt_ops->ldto_fini(ldt);
+       cfs_list_del_init(&ldt->ldt_linkage);
+       if (ldt->ldt_ops->ldto_fini)
+               ldt->ldt_ops->ldto_fini(ldt);
 }
 EXPORT_SYMBOL(lu_device_type_fini);
 
@@ -739,10 +741,10 @@ void lu_types_stop(void)
 {
         struct lu_device_type *ldt;
 
-        cfs_list_for_each_entry(ldt, &lu_device_types, ldt_linkage) {
-                if (ldt->ldt_device_nr == 0)
-                        ldt->ldt_ops->ldto_stop(ldt);
-        }
+       cfs_list_for_each_entry(ldt, &lu_device_types, ldt_linkage) {
+               if (ldt->ldt_device_nr == 0 && ldt->ldt_ops->ldto_stop)
+                       ldt->ldt_ops->ldto_stop(ldt);
+       }
 }
 EXPORT_SYMBOL(lu_types_stop);