[Bugs] [Bug 1412069] No rollback of renames on succeeded subvols during failure

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1412069



--- Comment #2 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: http://review.gluster.org/15739 committed in master by Raghavendra G
(rgowdapp at redhat.com) 
------
commit bb438d849a4a3941c1a9b525213f695f0a2c961b
Author: Csaba Henk <csaba at redhat.com>
Date:   Thu Oct 27 07:30:48 2016 +0200

    feature/dht: undo partially successful dir rename

    As with dht, dirs are present on all subvolumes,
    renaming them is a compound operation and thus a
    partial success + partial failure scenario is
    possible, resulting in an inconsistent state.

    For purposes of reproduction, such a scenario can
    easily be produced by stopping the volume, edit the
    volfile of a certain subvolume to get at an
    "option read-only on" setting, and then restart
    the volume. Thus those operations that are to make change
    on the affected subvolume will fail with EROFS.

    To handle such scenarios, we introduce an in-memory cache
    where we record the return values obtained from the
    subvolumes. At the final stage of the dir rename operation
    we check if it's a partial success/fail situation. If yes,
    then we perform a reverse rename op on those subvolumes
    where the operation succeeded.

    Change-Id: I3d05f74f53932cb984a918d252a7309c1009a51d
    BUG: 1412069
    Signed-off-by: Raghavendra G <rgowdapp at redhat.com>
    Reviewed-on: http://review.gluster.org/15739
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: N Balachandran <nbalacha at redhat.com>

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