zpool import speedup

@@ -133,12 +133,15 @@
 
 #define DMU_OS_IS_L2COMPRESSIBLE(os)    (zfs_mdcomp_disable == B_FALSE)
 
 /* called from zpl */
 int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
+int dmu_objset_hold_nolock(const char *name, void *tag, objset_t **osp);
 int dmu_objset_own(const char *name, dmu_objset_type_t type,
     boolean_t readonly, void *tag, objset_t **osp);
+int dmu_objset_own_nolock(const char *name, dmu_objset_type_t type,
+    boolean_t readonly, void *tag, objset_t **osp);
 void dmu_objset_refresh_ownership(objset_t *os, void *tag);
 void dmu_objset_rele(objset_t *os, void *tag);
 void dmu_objset_disown(objset_t *os, void *tag);
 int dmu_objset_from_ds(struct dsl_dataset *ds, objset_t **osp);