Xen devel - Dec 2007 - tools/examples/block better use of losetup -r

The attached change arranges to use losetup -r when the vbd is
specified to be readonly, but only if -r is supported (rather than
always creating a writeable losetup mapping if possible).

This was inspired by (but not derived from) a diff from the Fedora 8
patchset which uses -r iff the vbd is specified as readonly.  We need
to be cleverer upstream because not all systems have losetup -r.

Ian.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>



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