I was going through the code and realized io_uring is similar to libev in the way that we listen to the io events ourselves but the difference is when we encounter the event we read it ourselves(io_uring), whereas in the case of libev we ask libnbd to read it for us. We notify that the connection is readable using ai_notify_read and the command is ran by the state machine the command was queued by an earlier call to nbd_aio_pread.

My question is if we read from the socket using (let's say read[1]) what do we need to do to inform the state machine we have done so, so that it can function properly as I am assuming nbd_aio_pread modifies the state in some way on enqueue and completion

Thanks and regards,

Abhay

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[1]: io_uring has read but not recv in kernel 5.5