Hi all,

This small patch enables you to loopback disk image files on readonly nfs 
filesystem on some system.

When we losetup a file on readonly nfs filesystem, it fails with:
# losetup /dev/loop7 /data/vm/xen_el5_i386_para/system.raw
/data/vm/xen_el5_i386_para/system.raw: Permission denied

New version of losetup has add a "-r" option for readonly loop, which Linux 
kernel has supported for a long time. Some distribution (EL5 update, Fedora 8, 
etc.) have shipped it. This patch benefit this option while doesn't break the 
old versions of losetup.

Signed-off-by: Zhigang Wang <zhigang.x.wang@oracle.com>

regards,

zhigang