Sheepdog creating a VDI process

Sd_create_hyper_volume--->OPCODE:SD_OP_NEW_VDI
Exec_local_req
Submit_local_request---> Add req to Sys->local_req_queue
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Local_req_handler---> Handling local messages
Queue_request---> select processing based on OP type
Queue_cluster_request---> Call cluster Driver (zookeeper) to send messages globally
sys->cdrv->block<--->zk_block
Add_event--->type:event_block
Zk_queue_push
Zk_create_seq_node---> Add ZK event with monotonically increasing event sequence
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Zk_event_handler---> Call zk_event_handlers
Zk_handle_block---> Remove the Head node request, the request is not removed from the list until unblock arrives
Sd_block_handler---> Non-processing messages are returned directly, registering operation functions Do_process_work and Cluster_op_done,
Set cluster_op_running to true to ensure that blocked requests are executed serially
Queue_work---> Add req messages to Sys->block_wqueue, wake up worker threads
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-------worker_routine---> Worker thread callback function, add to finished_list after completion
| WORK-&GT;FN (Work) <---->do_process_work
| Req->op->process_work (req) <---&GT;CLUSTER_NEW_VDI
| Vdi_create---> Get available vid, create VDI
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|------>worker_thread_request_done to handle tasks on finished_list
Work->done (Work) <---->cluster_op_done
PREPARE_CLUSTER_MSG---> Build messages that need to be sent
sys->cdrv->unblock<---->zk_unblock
Add_event---> Add event_unblock event to send a build message
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Zk_event_handler---> Call zk_event_handlers
Zk_handle_unblock
Sd_notify_handler---> This node message req need put, not this node message for main processing, set Sd_notify_handler to False
Do_process_main---> Invoke the registered main function
op->process_main<----&GT;POST_CLUSTER_NEW_VDI
Atomic_set_bit (NR, sys->vdi_inuse)---> The corresponding position bit when successful