[Bugs] [Bug 1361300] Direct io to sharded files fails when on zfs backend

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1361300



--- Comment #3 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/15039 committed in master by Pranith Kumar
Karampuri (pkarampu at redhat.com) 
------
commit b20b3c68d32f6dba3f7e003f3ad9b86220d9fa25
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

    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: Ifb674dc7123f79fec9a9ac1ec7bf832f4df17627
    BUG: 1361300
    Signed-off-by: Krutika Dhananjay <kdhananj at redhat.com>
    Reviewed-on: http://review.gluster.org/15039
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>

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