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

[bugzilla at redhat.com]

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

            Bug ID: 1386072
           Summary: Spurious permission denied problems observed
           Product: GlusterFS
           Version: 3.9
         Component: posix
          Assignee: bugs at gluster.org
          Reporter: pkarampu at redhat.com
                CC: bugs at gluster.org
        Depends On: 1386071



+++ This bug was initially created as a clone of Bug #1386071 +++

Description of problem:
    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.



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Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1386071
[Bug 1386071] Spurious permission denied problems observed
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