[Bugs] [Bug 1637934] glusterfsd is keeping fd open in index xlator

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1637934

Worker Ant <bugzilla-bot at gluster.org> changed:

           What    |Removed                     |Added
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             Status|POST                        |MODIFIED



--- Comment #3 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/21379 committed in master by "Amar Tumballi"
<amarts at redhat.com> with a commit message- core: glusterfsd keeping fd open in
index xlator

Problem: At the time of processing GF_EVENT_PARENT_DOWN
         at brick xlator, it forwards the event to next xlator
         only while xlator ensures no stub is in progress.
         At io-thread xlator it decreases stub_cnt before the process
         a stub and notify EVENT to next xlator

Solution: Introduce a new counter to save stub_cnt and decrease
          the counter after process the stub completely at io-thread
          xlator.
          To avoid brick crash at the time of call xlator_mem_cleanup
          move only brick xlator if detach brick name has found in
          the graph

Note: Thanks to pranith for sharing a simple reproducer to
      reproduce the same

fixes bz#1637934
Change-Id: I1a694a001f7a5417e8771e3adf92c518969b6baa
Signed-off-by: Mohit Agrawal <moagrawal at redhat.com>

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