• David Teigland's avatar
    dlm: detect available userspace daemon · dc68c7ed
    David Teigland authored
    If dlm_controld (the userspace daemon that controls the setup and
    recovery of the dlm) fails, the kernel should shut down the lockspaces
    in the kernel rather than leaving them running.  This is detected by
    having dlm_controld hold a misc device open while running, and if
    the kernel detects a close while the daemon is still needed, it stops
    the lockspaces in the kernel.
    Knowing that the userspace daemon isn't running also allows the
    lockspace create/remove routines to avoid waiting on the daemon
    for join/leave operations.
    Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>