[Bugs] [Bug 1177928] Directories not visible anymore after add-brick, new brick dirs not part of old bricks

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1177928



--- Comment #5 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/9374 committed in release-3.5 by Niels de Vos
(ndevos at redhat.com) 
------
commit bb8845d3bd94f94a1302bb50811be209a7253dcb
Author: Pranith Kumar K <pkarampu at redhat.com>
Date:   Wed Dec 31 16:41:43 2014 +0530

    cluster/afr: serialize inode locks

          Backport of http://review.gluster.com/9372

    Problem:
    Afr winds inodelk calls without any order, so blocking inodelks
    from two different mounts can lead to dead lock when mount1 gets
    the lock on brick-1 and blocked on brick-2 where as mount2 gets
    lock on brick-2 and blocked on brick-1

    Fix:
    Serialize the inodelks whether they are blocking inodelks or
    non-blocking inodelks.

            Non-blocking locks also need to be serialized.
    Otherwise there is a chance that both the mounts which issued same
    non-blocking inodelk may endup not acquiring the lock on any-brick.
    Ex:
    Mount1 and Mount2 request for full length lock on file f1.  Mount1 afr may
    acquire the partial lock on brick-1 and may not acquire the lock on brick-2
    because Mount2 already got the lock on brick-2, vice versa. Since both the
    mounts only got partial locks, afr treats them as failure in gaining the
locks
    and unwinds with EAGAIN errno.

    Change-Id: I939a1d101e313a9f0abf212b94cdce1392611a5e
    BUG: 1177928
    Signed-off-by: Pranith Kumar K <pkarampu at redhat.com>
    Reviewed-on: http://review.gluster.org/9374
    Reviewed-by: Krutika Dhananjay <kdhananj at redhat.com>
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Niels de Vos <ndevos at redhat.com>

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