Bug 1240920

+++ This bug was initially created as a clone of Bug #1221008 +++

Description of problem:
When glfs_* methods operating on glfd are invoked after calling
glfs_close(), the program segfaults inside __GLFS_ENTRY_VALIDATE_FD
trying to deference glfd->fd->inode which is invalid.

Version-Release number of selected component (if applicable):
Master branch of glusterfs


Steps to Reproduce (Example using python binding)
#!/usr/bin/env python

from glusterfs import gfapi
import os

v = gfapi.Volume("pp", "real")
v.mount()
f = v.open("file", os.O_RDONLY) # assuming file exists
f.close()
f.read() # This will segfault


Actual results:
Segfault with code dump

Expected results:
Gracefully exit with errno set to EBADF

--- Additional comment from Anand Avati on 2015-05-13 02:25:55 EDT ---

REVIEW: http://review.gluster.org/10759 (libgfapi: Gracefully exit when glfd is invalid) posted (#3) for review on master by Prashanth Pai (ppai)

--- Additional comment from Anand Avati on 2015-05-13 02:46:40 EDT ---

REVIEW: http://review.gluster.org/10759 (libgfapi: Gracefully exit when glfd is invalid) posted (#4) for review on master by Prashanth Pai (ppai)

--- Additional comment from Anand Avati on 2015-05-14 00:32:43 EDT ---

REVIEW: http://review.gluster.org/10759 (libgfapi: Gracefully exit when glfd is invalid) posted (#5) for review on master by Prashanth Pai (ppai)

--- Additional comment from Anand Avati on 2015-07-07 11:06:46 EDT ---

COMMIT: http://review.gluster.org/10759 committed in master by Shyamsundar Ranganathan (srangana) 
------
commit afa793ff16b349989ca7c958466eae15d2d003f9
Author: Prashanth Pai <ppai>
Date:   Tue May 12 16:36:55 2015 +0530

    libgfapi: Gracefully exit when glfd is invalid
    
    When glfs_* methods operating on glfd are invoked after calling
    glfs_close(), the program segfaults inside __GLFS_ENTRY_VALIDATE_FD
    trying to deference glfd->fd->inode which is invalid.
    
    Also, returning EBADF seemed more specific than EINVAL.
    
    BUG: 1221008
    Change-Id: I13a92dca52da9a300252b69e026581b3a9e931fd
    Signed-off-by: Prashanth Pai <ppai>
    Reviewed-on: http://review.gluster.org/10759
    Tested-by: Gluster Build System <jenkins.com>
    Reviewed-by: Shyamsundar Ranganathan <srangana>

--- Additional comment from Anand Avati on 2015-07-08 02:39:13 EDT ---

REVIEW: http://review.gluster.org/11571 (libgfapi: Gracefully exit when glfd is invalid) posted (#1) for review on release-3.7 by Prashanth Pai (ppai)