Add a `isErr` function to check for errs.

DisksInfo() should handle collection of some
base errors as offlineDisks.

cmd/errors.go

@@ -121,12 +121,15 @@ func errorsCause(errs []error) []error {
 	return cerrs
 }
 
-var baseIgnoredErrs = []error{
+// Collection of basic errors.
+var baseErrs = []error{
 	errDiskNotFound,
 	errFaultyDisk,
 	errFaultyRemoteDisk,
 }
 
+var baseIgnoredErrs = baseErrs
+
 // isErrIgnored returns whether given error is ignored or not.
 func isErrIgnored(err error, ignoredErrs ...error) bool {
 	err = errorCause(err)
@@ -137,3 +140,14 @@ func isErrIgnored(err error, ignoredErrs ...error) bool {
 	}
 	return false
 }
+
+// isErr returns whether given error is exact error.
+func isErr(err error, errs ...error) bool {
+	err = errorCause(err)
+	for _, exactErr := range errs {
+		if err == exactErr {
+			return true
+		}
+	}
+	return false
+}

cmd/xl-v1.go

@@ -169,10 +169,10 @@ func getDisksInfo(disks []StorageAPI) (disksInfo []disk.Info, onlineDisks int, o
 		info, err := storageDisk.DiskInfo()
 		if err != nil {
 			errorIf(err, "Unable to fetch disk info for %#v", storageDisk)
-			if err == errDiskNotFound {
+			if isErr(err, baseErrs...) {
 				offlineDisks++
+				continue
 			}
-			continue
 		}
 		onlineDisks++
 		disksInfo[i] = info