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84678267e4
By opening a RBD volume in Read-Only we do not register a watcher on the header object inside the Ceph cluster. Refreshing a volume only calls rbd_stat() which is a operation which does not write to a RBD image. This allows us to use a cephx user which has no write permissions if we would want to use the libvirt storage pool for informational purposes only. It also saves us a write into the Ceph cluster which should speed up refreshing a RBD pool. rbd_open_read_only() is available in all librbd versions which also support rbd_open(). Signed-off-by: Wido den Hollander <wido@widodh.nl>
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>