On Thu, 2018-01-25 at 14:19 +0000, Shahar Salzman wrote:
> I am glad that this is your intention, the question is, do you think that it
> would be useful to create such a bdev_user module which will allow other users
> to integrate spdk to their appliance using such a simple threading model?
> Perhaps such a module will allow easier integration of spdk.
> 
> I am attaching a reference application which is does NULL IO via bdev_user.
> 

I spent some time reviewing the code you attached. I'll do a deep dive response
in the future, but several people in the community have been working to write a
guide to the bdev layer (including writing a bdev module), plus some better
examples. Before I do a big response, I want some of that documentation to get
posted and then we can use it as the basis for a discussion. I'm just writing
now to let you know that a response is coming!