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    Subject[RFC][PATCH 0/7] Clone PTS namespace

    Devpts namespace patchset

    In continuation of the implementation of containers in mainline, we need to
    support multiple PTY namespaces so that the PTY index (ie the tty names) in
    one container is independent of the PTY indices of other containers. For
    instance this would allow each container to have a '/dev/pts/0' PTY and
    refer to different terminals.

    [PATCH 1/7]: Propagate error code from devpts_pty_new
    [PATCH 2/7]: Factor out PTY index allocation
    [PATCH 3/7]: Enable multiple mounts of /dev/pts
    [PATCH 4/7]: Allow mknod of ptmx and tty in devpts
    [PATCH 5/7]: Implement get_pts_ns() and put_pts_ns()
    [PATCH 6/7]: Determine pts_ns from a pty's inode
    [PATCH 7/7]: Enable cloning PTY namespaces

    Todo:
    - This patchset depends on availability of additional clone flags.
    and relies on on Cedric's clone64 patchset. See

    http://marc.info/?l=linux-kernel&m=120272411925609&w=2

    - Needs some cleanup and more testing

    - Ensure patchset is bisect-safe

    ---
    Changelogs from earlier posts to Containers@.

    Changelog[v2]:

    (Patches 4 and 6 differ significantly from [v1]. Others are mostly
    the same)

    - [Alexey Dobriyan, Pavel Emelyanov] Removed the hack to check for
    user-space mount.

    - [Serge Hallyn] Added rcu locking around access to sb->s_fs_info.

    - [Serge Hallyn] Allow creation of /dev/pts/ptmx and /dev/pts/tty
    devices to simplify the process of finding the 'owning' pts-ns
    of the device (specially when accessed from parent-pts-ns)
    See patches 4 and 6 for details.

    Changelog[v1]:
    - Fixed circular reference by not caching the pts_ns in sb->s_fs_info
    (without incrementing reference count) and clearing the sb->s_fs_info
    when destroying the pts_ns

    - To allow access to a child container's ptys from parent container,
    determine the 'pts_ns' of a 'pty' from its inode.

    - Added a check (hack) to ensure user-space mount of /dev/pts is
    done before creating PTYs in a new pts-ns.

    - Reorganized the patchset and removed redundant changes.

    - Ported to work wih Cedric Le Goater's clone64() system call now
    that we are out of clone_flags.

    Changelog[v0]:

    This patchset is based on earlier versions developed by Serge Hallyn
    and Matt Helsley.


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