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9nbd does not properly report 9p transport errors #1

@garlick

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@garlick

In debugging netroot and the nbd9 dracut module, we encountered a situation where the name of the export did not match the name of the mount path. 9P was returning error 2 (ENOENT), but 9nbd was reporting EPROTO.

This slowed us down finding the root cause. It would be better if 9nbd had reported the 9P transport error directly.

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