[Bugs] [Bug 1179169] tar on a gluster directory gives message "file changed as we read it" even though no updates to file in progress

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1179169



--- Comment #9 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/9465 committed in master by Raghavendra G
(rgowdapp at redhat.com) 
------
commit 6c10f6db7c53e96881b29ca70dfc08b1ffb231b3
Author: Krutika Dhananjay <kdhananj at redhat.com>
Date:   Tue Jan 20 14:58:34 2015 +0530

    cluster/dht: In MKDIR(), aggregate iatts from non-hashed subvols too

    PROBLEM:

    Gathering iatts from ONLY the hashed subvol during MKDIR and unwinding
    them can cause md-cache to cache and serve these values for a while to
    the application.
    And then, at a later point of time, when a LOOKUP on either the dir or
    its parent gathers attributes from all subvolumes of dht and things are
    evened out as part of DHT_UPDATE_TIME, the application could be getting
    a different set of [cm]times (i.e., one of the non-hashed subvolumes'
    times could be selected by virtue of having the highest values),
    causing it to think the directory underwent modification even when it
    might not have.

    The effect of this bug becomes apparent in programs like tar, which rely
    on the ctime of the files before and after archiving a file to
    ascertain that the file remained unchanged during this time.

    FIX:

    Aggregate iatts from ALL sub-volumes of DHT during MKDIR.

    Change-Id: I04c4ca3e3b9552772e2b089be680f8afeb72089e
    BUG: 1179169
    Signed-off-by: Krutika Dhananjay <kdhananj at redhat.com>
    Reviewed-on: http://review.gluster.org/9465
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Raghavendra G <rgowdapp at redhat.com>
    Tested-by: Raghavendra G <rgowdapp at redhat.com>

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