[Bugs] [Bug 1694562] New: gfapi: do not block epoll thread for upcall notifications

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1694562

            Bug ID: 1694562
           Summary: gfapi: do not block epoll thread for upcall
                    notifications
           Product: GlusterFS
           Version: 5
          Hardware: All
                OS: All
            Status: NEW
         Component: libgfapi
          Severity: high
          Assignee: bugs at gluster.org
          Reporter: skoduri at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org, pasik at iki.fi
        Depends On: 1693575
            Blocks: 1694561
  Target Milestone: ---
    Classification: Community



+++ This bug was initially created as a clone of Bug #1693575 +++

Description of problem:

With https://review.gluster.org/#/c/glusterfs/+/21783/, we have made changes to
offload processing upcall notifications to synctask so as not to block epoll
threads. However seems like the purpose wasnt fully resolved. 

In "glfs_cbk_upcall_data" -> "synctask_new1" after creating synctask if there
is no callback defined, the thread waits on synctask_join till the syncfn is
finished. So that way even with those changes, epoll threads are blocked till
the upcalls are processed.

Hence the right fix now is to define a callback function for that synctask
"glfs_cbk_upcall_syncop" so as to unblock epoll/notify threads completely and
the upcall processing can happen in parallel by synctask threads.

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


How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:


Additional info:

--- Additional comment from Soumya Koduri on 2019-03-28 09:28:58 UTC ---

Users have complained about nfs-ganesha process getting stuck here -
https://github.com/nfs-ganesha/nfs-ganesha/issues/335

--- Additional comment from Worker Ant on 2019-03-28 09:34:11 UTC ---

REVIEW: https://review.gluster.org/22436 (gfapi: Unblock epoll thread for
upcall processing) posted (#1) for review on master by soumya k

--- Additional comment from Worker Ant on 2019-03-29 07:25:10 UTC ---

REVIEW: https://review.gluster.org/22436 (gfapi: Unblock epoll thread for
upcall processing) merged (#4) on master by Amar Tumballi


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1693575
[Bug 1693575] gfapi: do not block epoll thread for upcall notifications
https://bugzilla.redhat.com/show_bug.cgi?id=1694561
[Bug 1694561] gfapi: do not block epoll thread for upcall notifications
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