+
+struct mdstat_ent *mdstat_by_component(char *name)
+{
+ struct mdstat_ent *mdstat = mdstat_read(0, 0);
+
+ while (mdstat) {
+ struct dev_member *m;
+ struct mdstat_ent *ent;
+ if (mdstat->metadata_version &&
+ strncmp(mdstat->metadata_version, "external:", 9) == 0 &&
+ is_subarray(mdstat->metadata_version+9))
+ /* don't return subarrays, only containers */
+ ;
+ else for (m = mdstat->members; m; m = m->next) {
+ if (strcmp(m->name, name) == 0) {
+ free_mdstat(mdstat->next);
+ mdstat->next = NULL;
+ return mdstat;
+ }
+ }
+ ent = mdstat;
+ mdstat = mdstat->next;
+ ent->next = NULL;
+ free_mdstat(ent);
+ }
+ return NULL;
+}
+
+struct mdstat_ent *mdstat_by_subdev(char *subdev, char *container)
+{
+ struct mdstat_ent *mdstat = mdstat_read(0, 0);
+ struct mdstat_ent *ent = NULL;
+
+ while (mdstat) {
+ /* metadata version must match:
+ * external:[/-]%s/%s
+ * where first %s is 'container' and second %s is 'subdev'
+ */
+ if (ent)
+ free_mdstat(ent);
+ ent = mdstat;
+ mdstat = mdstat->next;
+ ent->next = NULL;
+
+ if (ent->metadata_version == NULL ||
+ strncmp(ent->metadata_version, "external:", 9) != 0)
+ continue;
+
+ if (!metadata_container_matches(ent->metadata_version+9,
+ container) ||
+ !metadata_subdev_matches(ent->metadata_version+9,
+ subdev))
+ continue;
+
+ free_mdstat(mdstat);
+ return ent;
+ }
+ return NULL;
+}