[Bugs] [Bug 1281598] Data Tiering: "ls" count taking link files and promote/demote files into consideration both on fuse and nfs mount

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1281598



--- Comment #13 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/12530 committed in master by Dan Lambright
(dlambrig at redhat.com) 
------
commit 3b52c71b0ab57a9daaf31bf3dc8563da37927a66
Author: Dan Lambright <dlambrig at redhat.com>
Date:   Wed Nov 4 15:33:22 2015 -0500

    cluster/tier: readdirp to cold tier only

    It is possible a file would get migrated in the middle
    of a readdir operation. If there are four subvolumes A,B,C,D,
    and if readdir reads them in order and reaches subvol B,
    then, if a file is moved from D to A, it will not be included
    in the readdir output.

    This phenonema has pre-existed in DHT migration but is more
    apparent in tiering.

    When a file is moved off the hashed subvolume a T file is created.
    For tiering, we will make the cold subvolume the hashed subvolume.
    This will ensure the creation of a T file. Readdir will not skip T
    files in the tier translator.

    Making the cold subvolume the hashed subvolume ensures the T
    files created on promotions or creates will be less likely to
    fill the volume.

    Creates still put the data on the hot subvolume.

    Change-Id: Ifde557d3d0e94a4570ca9f115adee3db2ee75407
    BUG:  1281598
    Signed-off-by: Dan Lambright <dlambrig at redhat.com>
    Reviewed-on: http://review.gluster.org/12530
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Tested-by: NetBSD Build System <jenkins at build.gluster.org>
    Reviewed-by: N Balachandran <nbalacha at redhat.com>
    Reviewed-by: Raghavendra G <rgowdapp at redhat.com>

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