revert "use stat -c linux command line to determise support create ti…

…me or not", and set nfs not suoport create time

test/jdk/java/nio/file/attribute/BasicFileAttributeView/CreationTime.java

@@ -109,10 +109,12 @@ static void test(Path top) throws IOException {
  }
  } else if (Platform.isLinux()) {
  // Creation time read depends on statx system call support and on the file
- // system storing the birth time. The tmpfs/ext3/nfs etc. file system type does not store
+ // system storing the birth time. The tmpfs/nfs etc. file system type does not store
  // the birth time.
  boolean statxIsPresent = Linker.nativeLinker().defaultLookup().find("statx").isPresent();
- if (statxIsPresent && supportBirthTimeOnLinux(file)) {
+ if (statxIsPresent &&
+ !Files.getFileStore(file).type().contentEquals("tmpfs") &&
+ !Files.getFileStore(file).type().contains("nfs")) {
  supportsCreationTimeRead = true;
  }
  // Creation time updates are not supported on Linux
@@ -148,25 +150,6 @@ static void test(Path top) throws IOException {
  }
  }
 
-
- /**
- * read the output of linux command `stat -c "%w" file`, if the output is "-",
- * then the file system doesn't support birth time
- */
- public static boolean supportBirthTimeOnLinux(Path file) {
- try {
- String filePath = file.toAbsolutePath().toString();
- ProcessBuilder pb = new ProcessBuilder("stat", "-c", "%w", filePath);
- pb.redirectErrorStream(true);
- Process p = pb.start();
- BufferedReader b = new BufferedReader(new InputStreamReader(p.getInputStream()));
- String l = b.readLine();
- if (l != null && l.equals("-")) { return false; }
- } catch(Exception e) {
- }
- return true;
- }
-
  public static void main(String[] args) throws IOException {
  // create temporary directory to run tests
  Path dir;