+/*
+ * Called when an unmount is requested and certain sanity checks have
+ * already passed. At this point no dentries or inodes have been reclaimed
+ * from their respective caches. We drop the extra reference on the .zfs
+ * control directory to allow everything to be reclaimed. All snapshots
+ * must already have been unmounted to reach this point.
+ */
+void
+zfs_preumount(struct super_block *sb)
+{
+ zfs_sb_t *zsb = sb->s_fs_info;
+
+ if (zsb != NULL && zsb->z_ctldir != NULL)
+ zfsctl_destroy(zsb);
+}
+EXPORT_SYMBOL(zfs_preumount);
+
+/*
+ * Called once all other unmount released tear down has occurred.
+ * It is our responsibility to release any remaining infrastructure.
+ */