[Bugs] [Bug 1200262] Upcall framework support along with cache_invalidation usecase handled

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1200262



--- Comment #7 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/9535 committed in master by Kaleb KEITHLEY
(kkeithle at redhat.com) 
------
commit 2b97b57cd8c71cb07b7002cf3483e9cfc9403c58
Author: Soumya Koduri <skoduri at redhat.com>
Date:   Sun Feb 15 23:35:56 2015 +0530

    Upcall: New xlator to store various states and send cbk events

    Framework on the server-side, to handle certain state of the files
    accessed and send notifications to the clients connected.

    A generic and extensible framework, used to maintain states in
    the glusterfsd process for each of the files accessed
    (including the clients info doing the fops) and send
    notifications to the respective glusterfs clients incase of
    any change in that state.

    This patch handles "Inode Update/Invalidation" upcall event.

    Feature page:
            URL:
http://www.gluster.org/community/documentation/index.php/Features/Upcall-infrastructure

    Below link has a writeup which explains the code changes done -
            URL:
https://soumyakoduri.wordpress.com/2015/02/25/glusterfs-understanding-upcall-infrastructure-and-cache-invalidation-support/

    Change-Id: Ie3d724be9a3419fcf18901a753e8ec2df2ac802f
    BUG: 1200262
    Signed-off-by: Soumya Koduri <skoduri at redhat.com>
    Reviewed-on: http://review.gluster.org/9535
    Reviewed-by: Kaleb KEITHLEY <kkeithle at redhat.com>
    Tested-by: Gluster Build System <jenkins at build.gluster.com>

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