[Libguestfs] [nbdkit PATCH 2/2] ruby: Support zero callback

[Richard W.M. Jones]

On Thu, Feb 02, 2017 at 01:45:38PM -0600, Eric Blake wrote:
> Add a ruby language binding for the .zero callback, used for
> implementing NBD_CMD_WRITE_ZEROES.  The caller doesn't have to
> return anything, but should use Nbdkit.set_error(errno::EOPNOTSUPP)
> to get an automatic fallback to pwrite.
> 
> Enhance the example to show the use of the fallback mechanism,
> and to serve as a test of Nbdkit.set_error().

Thanks - pushed both.

Rich.

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