XL: allow meta bucket name appended with tmp meta prefix. (#2007)

posix-utils_nix.go

@@ -18,19 +18,12 @@
 
 package main
 
-import (
-	"os"
-	"strings"
-)
+import "os"
 
 // isValidVolname verifies a volname name in accordance with object
 // layer requirements.
 func isValidVolname(volname string) bool {
-	if len(volname) < 3 || len(volname) > 63 {
-		return false
-	}
-	// Volname shouldn't have '/' in it.
-	return !strings.ContainsAny(volname, "/")
+	return !(len(volname) < 3 || len(volname) > 63)
 }
 
 // mkdirAll creates a directory named path,