On 3/2/22 17:52, Mike Christie wrote:
On 2/21/22 1:59 PM, Gabriel Krisman Bertazi wrote:
I'd like to discuss an interface to implement user space block devices,
while avoiding local network NBD solutions. There has been reiterated
Besides the tcmu approach, I've also worked on the local nbd based
solution like here:
https://github.com/gluster/nbd-runner
Have you looked into a modern take that uses io_uring's socket features
with the zero copy work that's being worked on for it? If so, what are
the issues you have hit with that? Was it mostly issues with the zero
copy part of it?
Problem is that we'd need an _inverse_ io_uring interface.
The current io_uring interface writes submission queue elements,
and waits for completion queue elements.
For this use-case we'd need to convert it to wait for submission queue
elements, and write completion queue elements.
IE completely invert the operation.
Not sure if we can convert it _that_ easily ...
Cheers,
Hannes
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Dr. Hannes Reinecke Kernel Storage Architect
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