Re: [Nbd] NBD wishlist items?

["Mike Snitzer" <snitzer@...17...>]

On 6/18/07, Wouter Verhelst <w@...112...> wrote:
> Hi!
>
> I've been working on NBD pretty much in a vacuum for most of the time,
> with the only input from other people being mostly bugreports.
>
> I know you LTSP people use NBD in a number of cases, and that you guys
> use some wrapper scripts. Which is cool and all, I guess, but I'd think
> it'd be better if you could do whatever you need to do without having to
> use wrapper scripts. Right?
>
> So, if there's any feature request you guys have, it'd be cool if you
> could communicate them to me. No guarantee I'll implement them within
> any defined amount of time (unless the request is accompanied by patches
> ;-), but I do plan to eventually implement them.


Wouter,

I've got one I'd like to run by you: have the nbd-client detect that
the kernel's nbd connection to the nbd-server is unresponsive.

There is a window of time where a potentially long TCP timeout
prevents the nbd (in kernel) from erroring out back to userspace
(nbd-client).  But if the nbd-client could feel that the nbd isn't
behaving the nbd-client could send a SIGKILL down to the kernel (nbd
driver already aborts TCP transmit if a SIGKILL is received).

Any ideas on how we might pull this off?

regards,
Mike