[Bugs] [Bug 1361449] Direct io to sharded files fails when on zfs backend

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1361449



--- Comment #2 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/15042 committed in release-3.8 by Pranith
Kumar Karampuri (pkarampu at redhat.com) 
------
commit b653bcbf652e05659189e2f9dbb9767dcd969d55
Author: Krutika Dhananjay <kdhananj at redhat.com>
Date:   Thu Jul 28 22:37:38 2016 +0530

    storage/posix: Look for file in "unlink" dir IFF open on real-path fails
with ENOENT

            Backport of: http://review.gluster.org/#/c/15039/

    PROBLEM:
    In some of our users' setups, open() on the anon fd failed for
    a reason other than ENOENT. But this error code is getting masked
    by a subsequent open() under posix's hidden "unlink" directory, which
    will fail with ENOENT because the gfid handle still exists under
.glusterfs.
    And the log message following the two open()s ends up logging ENOENT,
    causing much confusion.

    FIX:
    Look for the presence of the file under "unlink" ONLY if the open()
    on the real_path failed with ENOENT.

    Change-Id: Id83782fb3995d578881f7a586c83c3e0baea2ae8
    BUG: 1361449
    Signed-off-by: Krutika Dhananjay <kdhananj at redhat.com>
    Reviewed-on: http://review.gluster.org/15042
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>

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