Re: [Nbd] NBD_CMD_RESIZE

[Paul Clements <paul.clements@...856...>]

On Fri, May 17, 2013 at 2:06 PM, Nick Thomas <nick@...1344.....> wrote:

I notice that Alex Bligh proposed the addition of NBD_CMD_RESIZE (along
with some others) to the NBD protocol back in 2011:

http://comments.gmane.org/gmane.linux.drivers.nbd.general/993

I'm assuming this didn't go anywhere, at the time; would there be any
interest in reviving the idea? I find myself wanting to implement
block_resize in QEMU for NBD devices.

One option is to stop the NBD server, resize the file, start NBD again,
then run a peculiar version of block_resize that reconnects, reads the
new size and advertises that to the guest;

 

but NBD_CMD_RESIZE would be considerably simpler.

Agreed. 

I'd be open to patches, if you have some. Doesn't appear it would take much in the kernel to get this functioning.

--

Paul