static double diskSpacePercentage_oshi() {
  ret diskSpacePercentage_oshi(userDir()); // default to home partition
}

static double diskSpacePercentage_oshi(File f) {
  OSFileStore fs = oshi_findFileStore(f);
  if (fs == null) { // default to non-oshi
    long total = f.getTotalSpace();
    long usable = f.getUsableSpace();
    ret doubleRatio(total-usable, total);
  }
  
  long total = fs.getTotalSpace();
  long usable = fs.getUsableSpace();
  long total2 = fs.getTotalInodes();
  long usable2 = fs.getFreeInodes();
  
  ret max(doubleRatio(total-usable, total),
    total2 <= 0 ? 0 : doubleRatio(total2-usable2, total2))*100;
}