@@ -4115,3 +4115,55 @@ void bdrv_refresh_filename(BlockDriverState *bs)
QDECREF(json);
}
}
+
+/*
+ * Hot add/remove a BDS's child. So the user can take a child offline when
+ * it is broken and take a new child online
+ */
+void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs,
+ Error **errp)
+{
+
+ if (!parent_bs->drv || !parent_bs->drv->bdrv_add_child) {
+ error_setg(errp, "The BDS %s doesn't support adding a child",
+ bdrv_get_device_or_node_name(parent_bs));
+ return;
+ }
+
+ if (child_bs->blk) {
+ error_setg(errp, "The BDS %s is used by the block device %s",
+ child_bs->node_name, blk_name(child_bs->blk));
+ return;
+ }
+
+ /* TODO: check if the child bs has parent */
+
+ parent_bs->drv->bdrv_add_child(parent_bs, child_bs, errp);
+}
+
+void bdrv_del_child(BlockDriverState *parent_bs, BlockDriverState *child_bs,
+ Error **errp)
+{
+ BdrvChild *child;
+
+ if (!parent_bs->drv || !parent_bs->drv->bdrv_del_child) {
+ error_setg(errp, "The BDS %s doesn't support removing a child",
+ bdrv_get_device_or_node_name(parent_bs));
+ return;
+ }
+
+ QLIST_FOREACH(child, &parent_bs->children, next) {
+ if (child->bs == child_bs) {
+ break;
+ }
+ }
+
+ if (!child) {
+ error_setg(errp, "The BDS %s is not the BDS %s's child",
+ bdrv_get_device_or_node_name(child_bs),
+ bdrv_get_device_or_node_name(parent_bs));
+ return;
+ }
+
+ parent_bs->drv->bdrv_del_child(parent_bs, child_bs, errp);
+}
@@ -603,4 +603,9 @@ void bdrv_io_plug(BlockDriverState *bs);
void bdrv_io_unplug(BlockDriverState *bs);
void bdrv_flush_io_queue(BlockDriverState *bs);
+void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child,
+ Error **errp);
+void bdrv_del_child(BlockDriverState *parent, BlockDriverState *child,
+ Error **errp);
+
#endif
@@ -288,6 +288,11 @@ struct BlockDriver {
*/
int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo);
+ void (*bdrv_add_child)(BlockDriverState *parent, BlockDriverState *child,
+ Error **errp);
+ void (*bdrv_del_child)(BlockDriverState *parent, BlockDriverState *child,
+ Error **errp);
+
QLIST_ENTRY(BlockDriver) list;
};