+ /* For software raids, this entry maintains pointers to the
+ * entries for the slave devices. The disk_util entries for
+ * the slaves devices should primarily be maintained through
+ * the disk_list list, i.e. for memory allocation and
+ * de-allocation, etc. Whereas this list should be used only
+ * for aggregating a software RAID's disk util figures.
+ */
+ struct flist_head slaves;
+