[Bugs] [Bug 1330241] Backport 'nuke' (fast tree deletion) functionality to 3.7

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1330241



--- Comment #2 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/14065 committed in release-3.7 by Raghavendra
G (rgowdapp at redhat.com) 
------
commit 7241756f94c975c89f6dc1023d2403f531e6f5ac
Author: Jeff Darcy <jdarcy at redhat.com>
Date:   Mon Apr 25 12:17:12 2016 -0400

    dht: add "nuke" functionality for efficient server-side deletion

    This is a backport of the following two patches (of which the second is a
    trivial adjustment to a timeout for a test added by the first).

        http://review.gluster.org/13878
        http://review.gluster.org/13935

    This turns a special xattr into an rmdir with flags set.  When that hits
    the posix translator on the server side, that causes the file/directory
    to be moved into the special "landfill" directory.  From there, the
    posix janitor thread will take care of deleting it entirely on the
    server side - traversing it recursively if necessary.  A couple of
    secondary issues were fixed to make this effective.

     * FUSE now ensures that setxattr values are NUL terminated.

     * The janitor thread now gets woken up immediately when something is
       placed in 'landfill' instead of only when file descriptors need to be
       closed.

     * The default landfill-emptying interval was reduced to 10s.

    To use the feature, issue a setxattr something like this:

       setfattr -n glusterfs.dht.nuke -v "" /mnt/glusterfs/vol/some_dir

    The value doesn't actually matter; the mere receipt of a request with
    this key is sufficient.  Some day it might be useful to allow setting a
    required value as a sort of password, so that only those who know it can
    access the underlying special functionality.

    Change-Id: I4132a30d1faa53a6682399ad1d9041e2c4519951
    BUG: 1330241
    Signed-off-by: Jeff Darcy <jdarcy at redhat.com>
    Reviewed-on: http://review.gluster.org/14065
    Smoke: Gluster Build System <jenkins at build.gluster.com>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: N Balachandran <nbalacha at redhat.com>
    Reviewed-by: Raghavendra G <rgowdapp at redhat.com>

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