[Bugs] [Bug 1368842] Applications not calling glfs_h_poll_upcall() have upcall events cached for no use

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1368842



--- Comment #2 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: http://review.gluster.org/15191 committed in master by Niels de Vos
(ndevos at redhat.com) 
------
commit 218c9b033fa44eacbc27d87491abd830548b362e
Author: Niels de Vos <ndevos at redhat.com>
Date:   Wed Aug 17 16:44:55 2016 +0200

    gfapi: do not cache upcalls if the application is not interested

    When the volume option 'features.cache-invalidation' is enabled, upcall
    events are sent from the brick process to the client. Even if the client
    is not interested in upcall events itself, md-cache or other xlators may
    benefit from them.

    By adding a new 'cache_upcalls' boolean in the 'struct glfs', we can
    enable the caching of upcalls when the application called
    glfs_h_poll_upcall(). NFS-Ganesha sets up a thread for handling upcalls
    in the initialization phase, and calls glfs_h_poll_upcall() before any
    NFS-client accesses the NFS-export.

    In the future there will be a more flexible registration API for
    enabling certain kind of upcall events. Until that is available, this
    should work just fine.

    Verificatio of this change is not trivial within our current regression
    test framework. The bug report contains a description on how to reliably
    reproduce the problem with the glusterfs-coreutils.

    Change-Id: I818595c92db50e6e48f7bfe287ee05103a4a30a2
    BUG: 1368842
    Signed-off-by: Niels de Vos <ndevos at redhat.com>
    Reviewed-on: http://review.gluster.org/15191
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Poornima G <pgurusid at redhat.com>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: soumya k <skoduri at redhat.com>
    Reviewed-by: Kaleb KEITHLEY <kkeithle at redhat.com>

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