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387cb8c6b2
Add the qemu-nbd tasks to the container cgroup to make sure those will be killed when the container is stopped. In order to reliably get the qemu-nbd tasks PIDs, we use /sys/devices/virtual/block/<DEV>/pid as qemu-nbd is daemonizing itself.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>