+
+/*
+ * Split a vdev.
+ */
+void
+vdev_split(vdev_t *vd)
+{
+ vdev_t *cvd, *pvd = vd->vdev_parent;
+
+ vdev_remove_child(pvd, vd);
+ vdev_compact_children(pvd);
+
+ cvd = pvd->vdev_child[0];
+ if (pvd->vdev_children == 1) {
+ vdev_remove_parent(cvd);
+ cvd->vdev_splitting = B_TRUE;
+ }
+ vdev_propagate_state(cvd);
+}
+
+void
+vdev_deadman(vdev_t *vd)
+{
+ int c;
+
+ for (c = 0; c < vd->vdev_children; c++) {
+ vdev_t *cvd = vd->vdev_child[c];
+
+ vdev_deadman(cvd);
+ }
+
+ if (vd->vdev_ops->vdev_op_leaf) {
+ vdev_queue_t *vq = &vd->vdev_queue;
+
+ mutex_enter(&vq->vq_lock);
+ if (avl_numnodes(&vq->vq_pending_tree) > 0) {
+ spa_t *spa = vd->vdev_spa;
+ zio_t *fio;
+ uint64_t delta;
+
+ /*
+ * Look at the head of all the pending queues,
+ * if any I/O has been outstanding for longer than
+ * the spa_deadman_synctime we log a zevent.
+ */
+ fio = avl_first(&vq->vq_pending_tree);
+ delta = ddi_get_lbolt64() - fio->io_timestamp;
+ if (delta > NSEC_TO_TICK(spa_deadman_synctime(spa))) {
+ zfs_dbgmsg("SLOW IO: zio timestamp %llu, "
+ "delta %llu, last io %llu",
+ fio->io_timestamp, delta,
+ vq->vq_io_complete_ts);
+ zfs_ereport_post(FM_EREPORT_ZFS_DELAY,
+ spa, vd, fio, 0, 0);
+ }
+ }
+ mutex_exit(&vq->vq_lock);
+ }
+}
+
+#if defined(_KERNEL) && defined(HAVE_SPL)
+EXPORT_SYMBOL(vdev_fault);
+EXPORT_SYMBOL(vdev_degrade);
+EXPORT_SYMBOL(vdev_online);
+EXPORT_SYMBOL(vdev_offline);
+EXPORT_SYMBOL(vdev_clear);
+#endif