For this plugin, if a tri-state can_cache is implemented, the code
from sh_can_fua could be reused:

https://github.com/libguestfs/nbdkit/blob/7a4f38f98920a1192e5c50ea9bd212e759e3f4e7/plugins/sh/sh.c#L530

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/

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