int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp) { blk->root = bdrv_root_attach_child(bs, "root", &child_root, blk->perm, blk->shared_perm, blk, errp); if (blk->root == NULL) { return -EPERM; } bdrv_ref(bs); notifier_list_notify(&blk->insert_bs_notifiers, blk); if (blk->public.throttle_group_member.throttle_state) { throttle_timers_attach_aio_context( &blk->public.throttle_group_member.throttle_timers, bdrv_get_aio_context(bs)); } return 0; }