[Bugs] [Bug 1278744] ec-readdir.t is failing consistently

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1278744



--- Comment #1 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/12562 committed in release-3.7 by Xavier
Hernandez (xhernandez at datalab.es) 
------
commit 06b888bbeac61aa1234b43e398431529988c28b6
Author: Pranith Kumar K <pkarampu at redhat.com>
Date:   Tue Nov 10 09:06:54 2015 +0530

    cluster/ec: fix bug in update_good

            Backport of http://review.gluster.com/12561

    Problem:
    Bricks that didn't participate in the fops are considered to be good. This
is
    happening two fold.

    Examples:
    Case-1:
    1) 2+1 volume. 'd1' directory on Brick-0 is bad.
    2) readdir takes locks and lock->good_mask is '7'
    3) readdir does xattrop and fop->mask is '6'.
    4) because fop->expected is '1' lock->good_mask remains '7'

    Case-2:
    1) when all the bricks are up, it does lock + xattrop before op and figures
out
       all the bricks are good.
    2) By the time second operation starts brick-0 is down. Now lock->good_mask
       will always have the '0' bit set as long as the operations are happening
on it.
       because: "lock->good_mask &= ~fop->mask | fop->remaining" fop->mask
doesn't
       have '0' th bit.
    3) When it comes time to perform the final xattrop in update_size_version
       brick-0 comes online because of which it gives the same version to
brick-0
       as well thinking it has participated in all the transactions till then,
even
       when it didn't participate in the transactions.

    Fix:
    Case-1's fix: Update lock->good_mask in ec_prepare_update_cbk with latest
    good/bad bricks
    Case-2's fix: Consider non-participating brick as bad.

    BUG: 1278744
    Change-Id: I5c2b07005107f3c067bac69da3b37ff39688bd69
    Signed-off-by: Pranith Kumar K <pkarampu at redhat.com>
    Reviewed-on: http://review.gluster.org/12562
    Tested-by: NetBSD Build System <jenkins at build.gluster.org>
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Xavier Hernandez <xhernandez at datalab.es>

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