[Bugs] [Bug 1460659] Avoid one extra call of l(get|list) xattr system call after use buffer in posix_getxattr

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1460659



--- Comment #2 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/17520 committed in master by Jeff Darcy
(jeff at pl.atyp.us) 
------
commit 89faa4661d1ef66a9f8fe3b79e26bf4505ab6c61
Author: Mohit Agrawal <moagrawa at redhat.com>
Date:   Mon Jun 12 16:30:20 2017 +0530

    posix: Avoid one extra call of l(get|list)xattr call after use buffer in
posix_getxattr

    Problem: In posix xlator posix_(f)getxattr is calling system
call(sys_lgetxattr)
             two times to fetch the xattr value.

    Solution: After use the extra buffer for first time calling we can avoid
second
              attempt of system call(sys_lgetxattr) calling in posix_getxattr
for most
              of the xattrs.

    BUG: 1460659
    Change-Id: I0d8da776c5bc86653d874a4629a73bbf65c621b8
    Signed-off-by: Mohit Agrawal <moagrawa at redhat.com>
    Reviewed-on: https://review.gluster.org/17520
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    Reviewed-by: Amar Tumballi <amarts at redhat.com>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Kinglong Mee

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