[Bugs] [Bug 1309462] Upgrade from 3.7.6 to 3.7.8 causes massive drop in write performance. Fresh install of 3.7.8 also has low write performance

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1309462



--- Comment #46 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/13626 committed in release-3.7 by Vijay
Bellur (vbellur at redhat.com) 
------
commit a8a8feb25216db2fa426b09d778f61c0f89d514c
Author: Poornima G <pgurusid at redhat.com>
Date:   Fri Feb 26 06:42:14 2016 -0500

    fuse: Add a new mount option capability

    Originally all security.* xattrs were forbidden if selinux is disabled,
    which was causing Samba's acl_xattr module to not work, as it would
    store the NTACL in security.NTACL. To fix this
http://review.gluster.org/#/c/12826/
    was sent, which forbid only security.selinux. This opened up a getxattr
    call on security.capability before every write fop and others.

    Capabilities can be used without selinux, hence if selinux is disabled,
    security.capability cannot be forbidden. Hence adding a new mount
    option called capability.

    Only when "--capability" or "--selinux" mount option is used,
    security.capability is sent to the brick, else it is forbidden.

    Backport of : http://review.gluster.org/#/c/13540/ &
                  http://review.gluster.org/#/c/13653/

    BUG: 1309462
    Change-Id: Ib8d4f32d9f1458f4d71a05785f92b526aa7033ff
    Signed-off-by: Poornima G <pgurusid at redhat.com>
    Reviewed-on: http://review.gluster.org/13626
    Tested-by: Vijay Bellur <vbellur at redhat.com>
    Smoke: Gluster Build System <jenkins at build.gluster.com>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.com>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    Reviewed-by: Vijay Bellur <vbellur at redhat.com>

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