Re: [Nbd] NBD server not working with qemu

[Alex King <alex@...2850...>]

Actually, I discovered I was sending an incorrect handshake with the wrong 
number of zeros.  Now that's fixed QEMU client is working fine.

Thanks,
Alex


On 26/02/17 21:08, Alex King wrote:
> I'm writing a simple NBD server in rust as a learning project.  I have 
> something simple working with the kernel NBC client, however, it does not work 
> with the QEMU client.
>
> I'm using Debian Jessie versions to test against.
>
> So far my server uses only the "un-fixed" new protocol (I'm working from 
> proto.md), without NBD_FLAG_NO_ZEROES.
>
> I'm wondering, since I can seem to work with the kernel client, if the QEMU 
> client (version 1:2.1+dfsg-12+deb8u6) is incompatible with that protocol?  The 
> handshaking completes (from my server's perspective), and then everything 
> stops with my server waiting for client requests which never come.
>
> I'll implement the fixed newstyle protocol and see if that fixes things.  But 
> would be interested to know if QEMU is supposed to support the unfixed protocol.
>
> Thanks,
>
> Alex