HelenOS sources

VBD_LABEL_DELETE  149 uspace/lib/device/src/vbd.c 	retval = async_req_1_0(exch, VBD_LABEL_DELETE, sid);
VBD_LABEL_DELETE  390 uspace/srv/bd/vbd/vbd.c 		case VBD_LABEL_DELETE:
HelenOS homepage, sources at GitHub