space_map_t vdev_dtl[DTL_TYPES]; /* in-core dirty time logs */
vdev_stat_t vdev_stat; /* virtual device statistics */
boolean_t vdev_expanding; /* expand the vdev? */
+ int vdev_open_error; /* error on last open */
+ kthread_t *vdev_open_thread; /* thread opening children */
/*
* Top-level vdev state.