[Bugs] [Bug 1338501] implement meta-lock/unlock for lock migration

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1338501



--- Comment #4 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/14462 committed in release-3.8 by Raghavendra
G (rgowdapp at redhat.com) 
------
commit 3682513827f0f61fac51fd49d69b1807401a9b77
Author: Susant Palai <spalai at redhat.com>
Date:   Fri Apr 22 15:20:39 2016 +0530

    posix/lock: implement meta-lock/unlock functionality

    problem : The lock state needs to be protected when rebalance is reading
the
    lock state on the source. Otherwise there will be locks left unmigrated.
    Hence, to synchronize incoming lock requests with lock-migration, meta lock
    is needed. Any new lock request will be queued if there is an active
meta-lock
    and with sucessful lock migration, will be unwound with EREMOTE, so that
    dht module can wind the request to the correct destination.

    On a successful lock migration, "pl_inode->migrated" flag is enabled.
Hence,
    any further request would be unwound with EREMOTE and will be redirected to
    new destination.

    More details can be found here:
   
https://github.com/gluster/glusterfs-specs/blob/master/accepted/Lock-Migration.md

    design discussion:
    https://www.gluster.org/pipermail/gluster-devel/2016-January/048088.html

    Change-Id: Ief033d5652b5ca4ba6f499110a521cae283d6aba
    BUG: 1338501
    Signed-off-by: Susant Palai <spalai at redhat.com>
    Reviewed-on: http://review.gluster.org/14462
    Tested-by: Kotresh HR <khiremat at redhat.com>
    Smoke: Gluster Build System <jenkins at build.gluster.com>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    Reviewed-by: Raghavendra G <rgowdapp at redhat.com>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.com>

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