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ublk-bpf2 - Coggle Diagram

- - - - allow BLK_MQ_F_BLOCKING
    - - for aio callback
  - - - ublk_bpf_complete_io
      - ublk_bpf_get_iod
      - ublk_bpf_lock_device & unlock pair
      - ublk_bpf_lock_queue and unlock pair
  - - - bpf_submit_req
        
        support callback
        
        by struct_ops prog?
        
        yes
        
        maybe not
        
        use per-device prog cb
        
        1 more item...
        
        how does kernel side register sops prog?
        
        how to call cb via prog?
        
        define bpf_aio_req structure
        
        fd
      - bpf_aio_alloc_req
        
        example
        
        bpf_cpumask_create
        
        doable
      - bpf_aio_free_req
      - struct bpf_aio_req
        
        bvec table
        
        wire request bvec table with bpf_aio_req
        
        uapi
        
        how to define buffer in generic way?
      - support multiple aios for single ublk rq
        
        central part for building bves
        
        support to advance bvec buffer
        
        add one ops flag for not populating bvec buffer
    - - start with FS AIO only
        
        keep it generic
        
        struct_ops callback is per-device
        
        this cb is for handling device specific completion
    - - blk backup
        
        blksnap
    - - keep kfunc generic
- - - - make it per-device
      - userspace need to setup dev id