Fix for diskusage Ceph mount

This sets `used` and `usedPercent` correctly in #1344

disk/disk_unix.go

@@ -27,13 +27,22 @@ func UsageWithContext(ctx context.Context, path string) (*UsageStat, error) {
 		InodesFree:  (uint64(stat.Ffree)),
 	}
 	
+	ret.Used = (uint64(stat.Blocks) - uint64(stat.Bfree)) * uint64(bsize)
+
+	if (ret.Used + ret.Free) == 0 {
+		ret.UsedPercent = 0
+	} else {
+		// We don't use ret.Total to calculate percent.
+		// see https://github.com/shirou/gopsutil/issues/562
+		ret.UsedPercent = (float64(ret.Used) / float64(ret.Used+ret.Free)) * 100.0
+	}
+
 	// if could not get InodesTotal, return empty
 	if ret.InodesTotal < ret.InodesFree {
 		return ret, nil
 	}
 
 	ret.InodesUsed = (ret.InodesTotal - ret.InodesFree)
-	ret.Used = (uint64(stat.Blocks) - uint64(stat.Bfree)) * uint64(bsize)
 
 	if ret.InodesTotal == 0 {
 		ret.InodesUsedPercent = 0
@@ -41,14 +50,6 @@ func UsageWithContext(ctx context.Context, path string) (*UsageStat, error) {
 		ret.InodesUsedPercent = (float64(ret.InodesUsed) / float64(ret.InodesTotal)) * 100.0
 	}
 
-	if (ret.Used + ret.Free) == 0 {
-		ret.UsedPercent = 0
-	} else {
-		// We don't use ret.Total to calculate percent.
-		// see https://github.com/shirou/gopsutil/issues/562
-		ret.UsedPercent = (float64(ret.Used) / float64(ret.Used+ret.Free)) * 100.0
-	}
-
 	return ret, nil
 }