Xen devel - Nov 2007 - [PATCH]Enable loopback disk image files on readonly nfs filesystem

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


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