The current code GridFile.java fails to create any new file with the file path containing parent components.
For example, the following code will fail to create the new file:

...
GridFileSystem fs= new GridFileSystem(data, metadata);
File gridDir = fs.getFile("/test");
gridDir.mkdirs();

//The following fails to create the file
File gridFile = fs.getFile("/test/myfile.txt");
gridFile.createNewFile(); //this line always returns false.
....

The root cause of the above failure is that the method of "checkParentDirs(String path, boolean create_if_absent)"
does not handle the parent dir already exists case correctly.