bdrv_unref(child_bs);
}
-void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child)
+/**
+ * Clear all inherits_from pointers from children and grandchildren of
+ * @root that point to @root, where necessary.
+ */
+static void bdrv_unset_inherits_from(BlockDriverState *root, BdrvChild *child)
{
- if (child == NULL) {
- return;
- }
-
- if (child->bs->inherits_from == parent) {
- BdrvChild *c;
+ BdrvChild *c;
- /* Remove inherits_from only when the last reference between parent and
- * child->bs goes away. */
- QLIST_FOREACH(c, &parent->children, next) {
+ if (child->bs->inherits_from == root) {
+ /*
+ * Remove inherits_from only when the last reference between root and
+ * child->bs goes away.
+ */
+ QLIST_FOREACH(c, &root->children, next) {
if (c != child && c->bs == child->bs) {
break;
}
}
}
+ QLIST_FOREACH(c, &child->bs->children, next) {
+ bdrv_unset_inherits_from(root, c);
+ }
+}
+
+void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child)
+{
+ if (child == NULL) {
+ return;
+ }
+
+ bdrv_unset_inherits_from(parent, child);
bdrv_root_unref_child(child);
}