[Bugs] [Bug 1295107] Fix mem leaks related to gfapi applications

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1295107



--- Comment #15 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/13096 committed in master by Kaleb KEITHLEY
(kkeithle at redhat.com) 
------
commit db747eba347e2909f4fb4fc28a67adb8f188586a
Author: Soumya Koduri <skoduri at redhat.com>
Date:   Mon Feb 8 22:33:56 2016 +0530

    gfapi: Use inode_forget in case of handle objects

    Currently with gfapi, even if applications release their
    reference on paritular inode entries, those entries never
    get destroyed as they shall always have positive nlookup
    count unless inode_table exceeds lru limit.

    Since inodes and their contexts can consume considerable
    amount of memory, applications may end up consuming lot of
    memory and may even get OOM killed.

    To avoid that, have considered below approaches (for handle based access)-
    a) Do 'inode_lookup' only if the corresponding inode is created
    for the first time and forget it during close of the handle

    This shall not work as multiple handle objects can refer to
    same inode entry and inode_forget from second handle object
    onwards shall result in assert.

    b) Do 'inode_lookup' during a handle or fd creation

    But this approach shall affect the performance of the fops which
    operate on neither handle nor fd.

    c) current approach taken-
    Applications using glfs handle objects hold a reference
    on corresponding inode entries. Hence it is safe to forget
    those inodes and make nlookup count to '0' while trying to
    delete those handle objects. That way the last unref (i.e,
    from the last handle close) shall result in inode_destroy().

    Change-Id: Id2c7ab178894a10c0030c143ba71e7813df8d18c
    Signed-off-by: Soumya Koduri <skoduri at redhat.com>
    BUG: 1295107
    Reviewed-on: http://review.gluster.org/13096
    Reviewed-by: jiffin tony Thottan <jthottan at redhat.com>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    Reviewed-by: Niels de Vos <ndevos at redhat.com>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.com>
    Smoke: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Kaleb KEITHLEY <kkeithle at redhat.com>

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