[Bugs] [Bug 1386072] Spurious permission denied problems observed

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1386072



--- Comment #2 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: http://review.gluster.org/15664 committed in release-3.9 by Pranith
Kumar Karampuri (pkarampu at redhat.com) 
------
commit 10f2cbdfe6b375dbe602ba2c1da09008057f52c8
Author: Pranith Kumar K <pkarampu at redhat.com>
Date:   Fri Sep 23 21:06:37 2016 +0530

    storage/posix: Fix race in posix_pstat

    Problem:
    When one thread is in the process of creating a file/directory
    and the other thread is doing readdirp, there is a chance that
    posix_pstat, creation fops race in the following manner which
    will lead to wrong stat values to be read by parent xlators
    like posix-acl.

    Creation fops                           posix_pstat() as part of readdirp
    1) file is created with uid/gid 0/0     1) does stat of the path that
                                               is created just now.
    2) Does chown to set the correct
       uid/gid
    3) Sets the acl/user/internal xattrs
    4) Sets the gfid on the entry and
       completes the creation of the file/dir
                                            2) fills the gfid in the iatt

    If unwind of readdirp hits server xlator before creation fop, then
    posix-acl remembers uid/gid of the file to be root/root and fails
    fops like open etc on it.

    Fix:
    Reverse the order of filling gfid and filling lstat() values in
    posix_pstat() so that if there is gfid in iatt buffer uid/gid
    are valid.

     >Change-Id: I46caa7f6da7abfa40a0b1d70e35b88de9c64959c
     >Signed-off-by: Pranith Kumar K <pkarampu at redhat.com>
     >Reviewed-on: http://review.gluster.org/15564
     >NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
     >CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
     >Smoke: Gluster Build System <jenkins at build.gluster.org>
     >Reviewed-by: Shyamsundar Ranganathan <srangana at redhat.com>

    BUG: 1386072
    Change-Id: Ida2bd7297de8e7f51bcb7deda8936ce64ea8ec2b
    Signed-off-by: Pranith Kumar K <pkarampu at redhat.com>
    Reviewed-on: http://review.gluster.org/15664
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    Smoke: Gluster Build System <jenkins at build.gluster.org>

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