HelenOS sources

INST_VOL_LABEL    180 uspace/app/sysinst/sysinst.c 	pspec.label = INST_VOL_LABEL;
INST_VOL_LABEL    296 uspace/app/sysinst/sysinst.c 	rc = vol_volume_lookup_ref(volumes, INST_VOL_LABEL, &volume);
HelenOS homepage, sources at GitHub