[Bugs] [Bug 1311146] New: glfs_dup() functionality is broken

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1311146

            Bug ID: 1311146
           Summary: glfs_dup() functionality is broken
           Product: GlusterFS
           Version: mainline
         Component: libgfapi
          Severity: medium
          Assignee: bugs at gluster.org
          Reporter: ppai at redhat.com
        QA Contact: sdharane at redhat.com
                CC: bugs at gluster.org



Description of problem:
***********************
glfs_dup() functionality is currently broken in glusterfs.


Steps to Reproduce: 
*******************
Code snippet from libgfapi-python tests:

    f = File(self.vol.open("dune", os.O_CREAT | os.O_EXCL | os.O_RDWR))
    f.write("I must not fear. Fear is the mind-killer.")
    fdup = f.dup()
    self.assertTrue(isinstance(fdup, File))
    f.close()
    ret = fdup.lseek(0, os.SEEK_SET)
    self.assertEqual(ret, 0)


Actual results:
***************
ERROR: test_write_file_dup_lseek_read
(test.functional.libgfapi-python-tests.FileOpsTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/src/libgfapi-python/test/functional/libgfapi-python-tests.py",
line 236, in test_write_file_dup_lseek_read
    ret = fdup.lseek(0, os.SEEK_SET)
  File "/root/src/libgfapi-python/gluster/gfapi.py", line 306, in lseek
    raise OSError(err, os.strerror(err))
OSError: [Errno 9] Bad file descriptor


Expected results:
*****************
lseek() should succeed.


Additional information
**********************
This change (http://review.gluster.org/13340) disallows any operation on
duplicate once the original fd is closed.

Seems like a deep copy of original fd instance should be done.

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