HelenOS sources

vol_info          302 uspace/app/vol/vol.c 		rc = vol_info(vol, volume_ids[i], &vinfo);
vol_info           59 uspace/lib/device/include/vol.h extern errno_t vol_info(vol_t *, volume_id_t, vol_info_t *);
vol_info          346 uspace/srv/system/system.c 		rc = vol_info(vol, volume_ids[i], &vinfo);
HelenOS homepage, sources at GitHub