fillInDiskStatus: update function to calculate new stats

weed/stats/disk_supported.go

@@ -17,5 +17,7 @@ func fillInDiskStatus(disk *volume_server_pb.DiskStatus) {
 	disk.All = fs.Blocks * uint64(fs.Bsize)
 	disk.Free = fs.Bfree * uint64(fs.Bsize)
 	disk.Used = disk.All - disk.Free
+	disk.PercentFree = float32((float64(disk.Free) / float64(disk.All)) * 100)
+	disk.PercentUsed = float32((float64(disk.Used) / float64(disk.All)) * 100)
 	return
 }